ISO 23219

• Abstract:

  This document specifies a text file format - XML file format - for reporting natural gas analysis results and other data relevant to natural gas. The file name is applicable when it includes the extension of .XML (case insensitive). The XML file format is useful for output from ISO 6974-1[1] for composition and ISO 6974-2[2] for uncertainty, for input for ISO 6976[3] and for input for ISO 10723[4] for performance evaluation. Typically these would be the gas composition as provided on an analysis certificate, or results from a performance evaluation that would be read into an Excel spreadsheet for data processing.

• Status: Not Published
• ICS: 35.240.50 - IT applications in industry
• ICS: 75.060 - Natural gas
• Technical Committee: ISO/TC 193 - Natural gas
• Drafting Committee: ISO/TC 193 - Natural gas
• Current Stage: 6000 - International Standard under publication
• Start Date: 05-Aug-2026
• Completion Date: 26-Sep-2026

• Revises: ISO 23219:2022 - Natural gas — Format for data from gas chromatograph analysers for natural gas — XML file format
• Effective Date: 08-Jul-2023

Overview

ISO 23219 specifies a standard XML file format for the reporting and exchange of natural gas analysis results from gas chromatograph analysers. Developed by ISO Technical Committee 193 (Natural gas), this international standard delivers a uniform digital structure for data relevant to natural gas, natural gas substitutes, and other combustible gaseous fuels. By harmonizing XML-based data output, ISO 23219 enables efficient sharing and integration of gas composition information across laboratories, operations, and digital systems, regardless of analyser type or data origin.

The XML file extension (.xml) ensures platform-independent operability and allows files to be seamlessly integrated into existing workflows, including spreadsheet processing, laboratory information systems, and property calculation software.

Key Topics

• XML Syntax and Structure
  The standard outlines detailed instructions for XML syntax, ensuring a hierarchical data structure for elements such as gas composition, analysis method, instrument details, measurement conditions, and uncertainty values.

• Element and Tag Naming
  Tags and element names are defined as lowercase words and concatenated with underscores if necessary (e.g., <retention_time>). Attributes within tags are not permitted; all data is stored as elements for clarity and compatibility.

• Date and Time Representation
  Utilizes ISO 8601-1 format (<date_time>YYYY-MM-DDThh:mm:ss+hh</date_time>) for any timestamps, including sample registration, result production, validation, and report issuance.

• Unit and Numeric Data Handling
  Units must follow standardized abbreviations (e.g., MJ/m³), be case sensitive, and not include extraneous spaces. All numeric values use periods as decimal separators and can employ E-notation for scientific values.

• Component Identification
  Gas components and sulfur compounds are unambiguously described using the International Chemical Identifier (InChI), facilitating consistent identification and interoperability.

• Uncertainty Specification
  Every measurement includes an associated uncertainty, with absolute values specified using dedicated XML tags, meeting ISO/IEC Guide 98-3 requirements.

• Metadata and Validation
  XML files must contain comprehensive metadata, including instrument details, analytical methods, and file integrity checks such as a CRC-16 checksum for simple data integrity assurance.

• Interoperability
  The standard supports outputs from ISO 6974-1/-2 (composition and uncertainty) and inputs for ISO 6976 (property calculations) and ISO 10723 (performance evaluation).

Applications

ISO 23219 finds broad application throughout the natural gas sector, including:

• Analytical Laboratories:
  Streamlines reporting from gas chromatograph analysers, regardless of manufacturer, by providing a common XML format for certificates and analytical results.

• Data Exchange:
  Facilitates digital exchange of gas composition data between testing labs, quality assurance teams, and operators in gas trading or distribution.

• Integration with ISO Standards:
  Serves as an input/output format for property calculation software implementing ISO 6976 (calorific value and properties) and ISO 10723 (performance evaluation).

• Downstream Processing:
  Enables straightforward import into spreadsheet editors and data management systems for further processing, statistical analysis, and reporting.

• Performance Evaluation:
  Standardizes data for inter-laboratory comparisons, instrument validation, and regulatory compliance documentation.

• Sulfur Compound Reporting:
  Supports detailed sulfur compound analysis, important for both environmental compliance and operational safety, with specific XML tags for sulfur species.

By enforcing a unified digital format, ISO 23219 reduces ambiguity, minimizes manual data handling, and promotes interoperability across systems in the natural gas industry.

Related Standards

Implementing ISO 23219 often involves coordination with the following ISO standards:

• ISO 6974-1 – Natural gas – Determination of composition: Gas chromatographic method
• ISO 6974-2 – Natural gas – Determination of composition: Uncertainty assessment
• ISO 6976 – Natural gas – Calculation of calorific values, density, relative density, and Wobbe index from composition
• ISO 10723 – Natural gas – Performance evaluation for analytical systems
• ISO 8601-1 – Date and time - Representations for information interchange

For organizations dealing with gas analysis, digital transformation, or regulatory compliance, adoption of ISO 23219 ensures consistency, efficiency, and global compatibility in reporting natural gas data.

DRAFT
International
Standard
ISO/DIS 23219
ISO/TC 193
Natural gas — Format for data from
Secretariat: NEN
gas chromatograph analysers for
Voting begins on:
natural gas — XML file format
2025-08-11
Gaz naturel — Format pour les données des analyseurs de
Voting terminates on:
chromatographie en phase gazeuse pour le gaz naturel —
2025-11-03
Format de fichier XML
ICS: 75.060; 35.240.50
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 23219:2025(en)
DRAFT
ISO/DIS 23219:2025(en)
International
Standard
ISO/DIS 23219
ISO/TC 193
Natural gas — Format for data from
Secretariat: NEN
gas chromatograph analysers for
Voting begins on:
natural gas — XML file format
Gaz naturel — Format pour les données des analyseurs de
Voting terminates on:
chromatographie en phase gazeuse pour le gaz naturel —
Format de fichier XML
ICS: 75.060; 35.240.50
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 23219:2025(en)
ii
ISO/DIS 23219:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic instructions . 1
4.1 Syntax .1
4.2 Element names.1
4.3 Attributes .1
4.4 Element data .2
4.5 Schema .2
4.6 Date and time .2
4.7 Numeric datatype .2
4.8 Units .3
4.9 Component data .3
4.10 Components names .3
4.11 Properties .3
4.12 Example keywords .3
4.13 Checksum .3
4.14 Software .3
5 General comments to keywords and units . 3
Annex A (normative) XML tags . 5
Annex B (informative) Software suitable for XML file processing . 19
Annex C (informative) International Chemical Identifier (InChI) .23
Bibliography .25

iii
ISO/DIS 23219:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO /TC 193, Natural gas .
This second edition cancels and replaces the first edition(ISO 23219:2022), which has been technically
revised.
The main changes are as follows:
— Added XML tags for the determination of sulfur compounds by gas chromatography to the text and
Annex A.
— Removed Annex B, C, D from first edition and converted into XML file in the ISO portal in electronic format.
— Added 2 parts ‘Example of a gas certificate for sulfur compound analysis’ and ‘Example of sulfur
compound analysis’ into XML file in the ISO portal in electronic format.
— Updated Annex B of second edition, Software suitable for XML file processing, based on the addition of
XML tags for sulfur compound analysis.
— Added InChI information for several sulfur compounds in Annex C of second edition.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 23219:2025(en)
Introduction
There are multiple suppliers of analysers for measurement of natural gas composition and sulfur compounds.
If correctly set up, there is no reason to prefer any one in particular, since they give comparable results.
However, the situation gives rise to a variety of methods of reporting data, which can create confusion over
the use of such data for off-line calculation of properties or evaluation of analyser performance.
Therefore, a uniform method of data presentation, independent of the source of the analyser, as presented in
this document is considered valuable.

v
DRAFT International Standard ISO/DIS 23219:2025(en)
Natural gas — Format for data from gas chromatograph
analysers for natural gas — XML file format
1 Scope
This document specifies a text file format - XML file format - for reporting natural gas analysis results and
other data relevant to natural gas, natural gas substitutes and other combustible gaseous fuels. The file
name is applicable when it includes the extension of .XML (case insensitive).
[1] [2]
The XML file format is useful for output from, for example, ISO 6974-1 for composition, ISO 19739 for
[3] [4]
sulfur compounds, and ISO 6974-2 for uncertainty, as input for ISO 6976 for properties calculation or
[5]
ISO 10723 for performance evaluation. Typically, these would be the gas composition as provided on an
analysis certificate. It can also be used for the results of properties calculation or a performance evaluation
that would be read into an Excel spreadsheet for data processing.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 8601, Date and time — Representations for information interchange — Part 1: Basic rules
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org
4 Basic instructions
4.1 Syntax
XML is composed of a hierarchical structure of elements which contain text data; elements are defined by an
opening tag – the element name enclosed in angular bracket, e.g. and a closing tag with / in front of
the element name, e.g.
4.2 Element names
Element names shall be lowercase (including inchi, which is usually written as InChI).
Any multiple word element names shall be concatenated with underscore, e.g.
In general element names should be complete words, rather short forms or acronyms.
4.3 Attributes
Tags shall not contain attributes, i.e. do not use:

ISO/DIS 23219:2025(en)


mg/m3
….


Use:

391.043

mg/m3
….


4.4 Element data
The text content of elements, e.g. keywords, are case insensitive, and leading and/or trailing spaces are
ignored.
4.5 Schema
The format of the XML file is defined in the schema given in Annex A.
The element names in the tags defined in the schema are case sensitive (they are all lowercase) and have no
leading or trailing spaces. The tags have no attributes, i.e. no name=”value” within the tag.
4.6 Date and time
Date and time are tagged and shall use the convention specified in ISO 8601, e.g. time>2018-07-10T13:59:00+01
This data may be used for
— date & time of sample registration,
— date & time when the results were produced,
— date & time when the results were validated, or
— date & time when the report was issued.
4.7 Numeric datatype
The numeric datatype Decimal (type xs:decimal or xs:float/xs:double) shall be chosen. Numbers shall not contain
spaces and shall use a period as the decimal separator; they shall not use grouping of digits, i.e. no thousands
separator (e.g. comma). E-notation shall be used for powers of 10, e.g. 34, 12.3, -3.4567, 5.6E3 and 7.8E-2

ISO/DIS 23219:2025(en)
4.8 Units
Units shall use a single solidus or -exponent, e.g. MJ/m3 (see annexes), or MJ·m-3 Units shall not contain
spaces. Units should be considered case sensitive and case used e.g. to distinguish the S.I. prefixes of m
(milli) and M (mega).
4.9 Component data
Component data shall be contained in blocks (see Annex A)
4.10 Components names
Component names shall use the InChI (International Chemical Identifier, https:// www .inchi -trust .org/ ) used
by IUPAC, see Annex C for commonly used natural gas components. This is unambiguous, reasonably concise,
non-proprietary, and since the chemical formula is part of the InChI it is often clear what the component
is. The alternative of using Chemical Abstracts Registry Number (CAS RN) is not so understandable and is
proprietary.
4.11 Properties
Properties shall be contained in a block, with each individual property in a separate
block, the property is identified with a keyword rather than by an XML tag (see annex A).
4.12 Example keywords
Example keywords and units are given in Annex A
In general, any keywords and units should be agreed between writing and reading applications.
Reading applications should ignore any keyword sections that are not relevant to their operation.
4.13 Checksum
The XML file shall have a checksum, e.g. CRC-16 check (hexadecimal) sum as displayed by ZIP programs,
at the end of the file as an XML comment, e.g. This is not intended for security purposes,
merely as a confidence check that the file contents have not been corrupted.
4.14 Software
Software, capable of processing XML data to Excel and vice versa is listed in Annex B.
5 General comments to keywords and units
5.1 Possible keywords and units are given in Annex A (see also example XML files on the ISO website).
5.2 Example gas component names are specified in Annex C.
5.3 Amount units:
— Amount of substance may be expressed as a fraction or percentage with an appropriate multiple or
submultiple prefix.
— It should be indicated whether the amount fractions are normalised or non-normalised.
— where volume based concentration units, e.g. mg/m , are used the reference conditions for the volume
(i.e. pressure and temperature) must be given in the units, and whether the volume amount includes
the named component or not. When used for sulfur compound analyses the reference conditions must

ISO/DIS 23219:2025(en)
consistent with the corresponding ISO standards (ISO 19739), the normal reference conditions of
pressure, temperature and humidity (state of saturation) equal to 101,325 kPa and 273,15 K for a dry,
real gas.
NOTE Fraction or percent can be mole basis or mass basis.
5.4 For calorific value (CV) the following definitions should be used:
— gross CV is the same as superior CV and higher CV, or
— net CV is the same as inferior CV and lower CV.
3 3
NOTE 1 Possible units may be MJ/m , kJ/mol, MJ/kg, Btu/ft
NOTE 2 Along with any physical properties, all necessary metadata should be included. For example, for ISO 6976,
this would encompass the metering and combustion temperatures, the pressure, and whether the properties are real
or ideal.
[7]
5.5 According to ISO/IEC Guide 98-3 every measurement should have an associated uncertainty.
Uncertainty shall be specified using the tag as an absolute value in the same units as the
measurement value (i.e. not as a relative percentage). The coverage factor for the uncertainty value shall
be specified using the tag. The form of the distribution may be specified using the
tag, if omitted, the distribution is assumed to be Normal (Gaussian).
5.6 For normalised compositions the amount fractions must sum to unity, hence there will always be
correlation between the amount fractions. The block is to allow for this.
NOTE See ISO 6976 for correlation matrix calculation.
5.7 Peak height and area have no need for units, only that the units should be consistent for that analyzer
and analysis. Retention time units can be seconds or minutes.

ISO/DIS 23219:2025(en)
Annex A
(normative)
XML tags
A.1 General
This annex provides descriptions of the elements of the XML file and includes an example of the XML schema.
These descriptions and examples are intended to assist in the implementation and validation of the XML format.
The following example XML and CSV files are available for download at https:// standards .iso .org/ iso/ 23219/
ed -2/ en as optional adjuncts to this document:
— example of a gas certificate for composition analysis in machine readable format
— example of composition analysis in machine readable format
— example of gas composition and properties
— example of a gas certificate for sulfur compound analysis in machine readable format
— example of sulfur compound analysis.
A.2 Root element
The root element of the XML file is which contains the two main blocks, and
.
A.3
The measurements block contains all elements related to the analysis of a sample.
A.3.1
The parameters block contains elements used to describe the sample.
A.3.1.1
See Clause 4.6
A.3.1.2
Text description of cylinder number.
A.3.1.3
Text description of certificate number.
A.3.1.4
Text description of sample point.

ISO/DIS 23219:2025(en)
A.3.1.5
Text description of sampling location.
A.3.2
The instrument block contains elements used to describe the instrument.
A.3.2.1
Text description of instrument type.
A.3.2.2
Text description of manufacturer.
A.3.2.3
Text description of serial_no.
A.3.2.4
Text description of id_no.
A.3.3
The method block contains elements used to describe the method used for the analysis.
A.3.3.1
Text description of the method name.
A.3.4
The peak blocks contain elements used to describe a peak in the chromatographic analysis, including
information about the component identification, quantitative results (the amounts) and chromatographic
information (retention time, peak area, etc.). A new peak block is used for each peak in the chromatogram.
A.3.4.1
The component block contains elements used to contain information about the identified component for the
chromatographic peak.
A.3.4.1.1
Text description of the component name.
A.3.4.1.2
The parameters blocks contain elements used to further characterize the component. A new parameters
block is used for each property of the component. These component properties may be required for the
calculation of bulk properties of the sample.
a)
Text description of the property. Example names (and units) :-

ISO/DIS 23219:2025(en)
molar_mass [kg/kmol]
boiling_point [K] (normal, at 101,325 kPa)
o
specific_gravity [-] (60/60 F relative density)
critical_temperature [K]
critical_pressure [MPa]
critical_volume [m /kmol]
critical_density [kg/m ]
acentric_factor [-]
Note that where the chemical formula of the component is needed for a calculation this can be obtained
from the inchi element (see A.2.4.1.3.)
b)
Numerical value of the property.
c)
Text description of the property units.
A.3.4.1.3
Text InChI descriptor of the component (see Annex C).
A.3.4.1.4
The amount block contains elements used to contain the quantitative results of the analysis for the peak (the
amount of substance).
a)
Numerical value of the amount.
b)
The units block contains elements used to describe the amount units.
1)
Text description of amount unit (see Clause 5).
2)
Text description of the basis of the units e.g. mole or mass. May be required for amounts expressed
as a percent.
3)
Text describing if amount fractions are normalised or non-normalised; can be ture or false.
4)
Optional block to describe the reference condition for volume based units.
i)
Numerical value of the reference pressure.

ISO/DIS 23219:2025(en)
ii)
Text description of reference pressure units.
iii)
Numerical value of the reference temperature.
iv)
Text description of reference temperature units.
c)
The uncertainty block contains optional elements used to contain data for the component amount’s
uncertainty.
1)
Numerical value of the uncertainty.
2)
Numerical value, e.g. for a 95 % confidence interval of a normal distribution the value is 1,96; which
is often taken as 2.
3)
Text description of the distribution (see Clause 5.5). If absent assumed normal.
4)
Integer value. The number of measurements used in the calculation of
5)
Integer value. Unique value for or .
A.3.4.2
Numerical value of the peak retention time.
A.3.4.3
Numerical value with arbitrary units (consistent throughout the file).
A.3.4.4
Numerical value with arbitrary units (consistent throughout the file).
A.3.5
Optional block to describe the correlation between amount fractions. See also Clause 5.6. If absent assumed
to be an identity matrix.
A.3.5.1
The element block contains values for each unique element in the correlation matrix.
A.3.5.1.1
Integer value. (Referenced by

ISO/DIS 23219:2025(en)
A.3.5.1.2
Integer value. (Referenced by )
A.3.5.1.3 >
Numerical value (in the range -1 to +1).
A.4
The properties block contains all elements related to bulk properties of the sample calculated from the
measurement data.
A.4.1
The method block contains elements related to a specific method used for properties calculation. Multiple
method blocks can be included if properties are calculated by different methods e.g. ISO 6976 and ISO 20765.
A.4.1.1
Text description of the method used.
A.4.1.2
The parameters block contains elements for parameters that are relevant to the method. Examples below.
A.4.1.2.1
Numerical value: <32 assumed oC, 32 to 100 assumed oF, >100 assumed K.
A.4.1.2.2
Numerical value: <32 assumed oC, 32 to 100 assumed oF, >100 assumed K.
A.4.1.2.3
Numerical value: >25 assumed kPa , <25 assumed psiA.
A.4.1.3
The property block contains elements describing the calculated property. Multiple property blocks can be
included.
A.4.1.3.1
Text description of the property.
Example names (followed by possible units in [], and symbols):-
[4]
ISO6976 properties :-
molar_mass [kg/kmol] M
gas_compression_factor [-] Z
volume_gross_calorific_value [MJ/m ] (Hv)
G
ISO/DIS 23219:2025(en)
molar_gross_calorific_value [kJ/mol] (Hc)
G
mass_gross_calorific_value [MJ/kg] (Hm)
G
volume_net_calorific_value [MJ/m ] (Hv)
N
molar_net_calorific_value [kJ/mol] (Hc)
N
mass_net_calorific_value [MJ/kg] (Hm)
N
relative_density [-] G
gas_density [kg/m ] D
wobbe_index [MJ/m ] W
G
net_wobbe_index [MJ/m ] W
N
3 0
ideal_volume_gross_calorific_value [MJ/m ] (Hv)
G
3 0
ideal_volume_net_calorific_value [MJ/m ] (Hv)
N
ideal_relative_density [-] G
3 0
ideal_gas_density [kg/m ] D
3 0
ideal_wobbe_index [MJ/m ] W
G
3 0
ideal_net_wobbe_index [MJ/m ] W
N
[6]
ISO 20765 properties :-
temperature [K] T
pressure [MPa] p
molar_helmholtz_free_energy [kJ/kmol] a
second_virial_coefficient [m /kmol] B
molar_isobaric_heat_capacity [kJ/kmol·K] c
p
molar_isochoric_heat_capacity [kJ/kmol·K] c
v
isochoric_heat_capacity [kJ/kg·K] C
v
isobaric_heat_capacity [kJ/kg·K] C
p
molar_density [kmol/m ] d ρ
density [kg/m ] D
molar_gibbs_free_energy [kJ/kmol] g
gibbs_free_energy [kJ/kg] G
molar_enthalpy [kJ/kmol] h
enthalpy [kJ/kg] H
molar_entropy [kJ/kmol·K] s
ISO/DIS 23219:2025(en)
entropy [kJ/kg·K] S
molar_internal_energy [kJ/kmol] u
internal_energy [kJ/kg] U
molar_volume [m /kmol] v
speed_of_sound [m/s] w
compression_factor [-] Z
isothermal_throttling_coefficient [m /kmol] ϕ
isentropic_exponent [-] κ
joule-thomson_coefficient [K/MPa] μ
viscosity [mPa·s] η
A.4.1.3.2
Numerical value of the property.
A.4.1.3.3
Text description of property units.
A.4.1.3.4
The uncertainty block contains elements used to contain data for the property’s uncertainty.
a)
Numerical value, in the same units as the property value.
b)
Numerical value. If absent one (1) is assumed, i.e. uncertainty is the standard deviation.
c)
Text description of the distribution. If absent normal is assumed.
d)
Optional text description of the method used for the uncertainty calculation.
XML schema (ISO23219.XSD)
Below is an example schema for the above content.
Note that it is permissible to add other tags that may be useful for a specific case, e.g. extra data not
considered here, and images & pictures etc.



ISO/DIS 23219:2025(en)









maxOccurs="1"/>
maxOccurs="1"/>










maxOccurs="1"/
...

FINAL DRAFT
International
Standard
ISO/FDIS 23219
ISO/TC 193
Natural gas — Format for data from
Secretariat: NEN
gas chromatograph analysers for
Voting begins on:
natural gas — XML file format
2026-06-09
Gaz naturel — Format pour les données des analyseurs de
Voting terminates on:
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Format de fichier XML
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Reference number
ISO/FDIS 23219:2026(en) © ISO 2026

FINAL DRAFT
ISO/FDIS 23219:2026(en)
International
Standard
ISO/FDIS 23219
ISO/TC 193
Natural gas — Format for data from
Secretariat: NEN
gas chromatograph analysers for
Voting begins on:
natural gas — XML file format
Gaz naturel — Format pour les données des analyseurs de
Voting terminates on:
chromatographie en phase gazeuse pour le gaz naturel —
Format de fichier XML
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 23219:2026(en) © ISO 2026

ii
ISO/FDIS 23219:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic instructions . 1
4.1 Syntax .1
4.2 Element names.1
4.3 Attributes .2
4.4 Element data .2
4.5 Schema .2
4.6 Date and time .2
4.7 Numeric datatype .2
4.8 Units .3
4.9 Component data .3
4.10 Components names .3
4.11 Properties .3
4.12 Example keywords .3
4.13 Checksum .3
4.14 Software .3
5 General comments to keywords and units . 3
Annex A (normative) XML tags . 5
Annex B (informative) Software suitable for XML file processing . 19
Annex C (informative) International Chemical Identifier (InChI) .23
Bibliography .25

iii
ISO/FDIS 23219:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO /TC 193, Natural gas.
This second edition cancels and replaces the first edition (ISO 23219:2022), which has been technically
revised.
The main changes are as follows:
— XML tags for the determination of sulfur compounds by gas chromatography have been added to the text
and Annex A;
— Annex B, Annex C and Annex D have been removed and converted into an XML file in the ISO Maintenance
Portal in electronic format;
— “Example of a gas certificate for sulfur compound analysis” and “Example of sulfur compound analysis”
have been added to the ISO Maintenance Portal in electronic format;
— Annex B has been updated based on the addition of XML tags for sulfur compound analysis;
— information on InChI for several sulfur compounds has been added to Annex C.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/FDIS 23219:2026(en)
Introduction
There are multiple suppliers of analysers for the measurement of natural gas composition and sulfur
compounds. If correctly set up, there is no reason to prefer any one in particular, since they give comparable
results. However, this gives rise to a variety of methods of reporting data, which can create confusion over
the use of such data for offline calculation of properties or evaluation of analyser performance.
Therefore, a uniform method of data presentation, independent of the source of the analyser, as presented in
this document is considered valuable.

v
FINAL DRAFT International Standard ISO/FDIS 23219:2026(en)
Natural gas — Format for data from gas chromatograph
analysers for natural gas — XML file format
1 Scope
This document specifies a text file format − XML file format − for reporting natural gas analysis results and
other data relevant to natural gas, natural gas substitutes and other combustible gaseous fuels. The file
name is applicable when it includes the extension of .XML (case insensitive).
The XML file format is useful for output from, for example, ISO 6974-1 for composition, ISO 19739 for sulfur
compounds and ISO 6974-2 for uncertainty, as input for ISO 6976 for properties calculation or ISO 10723 for
performance evaluation. Typically, these are the gas composition as provided on an analysis certificate. The
format can also be used for the results of properties calculation or a performance evaluation that can be
read into a spreadsheet editor or data processing.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 8601-1, Date and time — Representations for information interchange — Part 1: Basic rules
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org
4 Basic instructions
4.1 Syntax
XML is composed of a hierarchical structure of elements which contain text data.
Elements are defined by an opening tag which comprises the element name enclosed in angular bracket, e.g.
and a closing tag with / in front of the element name, e.g. .
4.2 Element names
Element names shall be lowercase (including inchi, which is usually written as InChI).
Any multiple word element names shall be concatenated with underscore, e.g. .
In general, element names should be complete words, rather short forms or acronyms.

ISO/FDIS 23219:2026(en)
4.3 Attributes
Tags shall not contain attributes, i.e. do not use:


mg/m3
….


Instead, use:

391.043

mg/m3
….


4.4 Element data
The text content of elements, e.g. keywords, are case insensitive. Leading and trailing spaces are ignored.
4.5 Schema
The format of the XML file is defined in the schema given in Annex A.
The element names in the tags defined in the schema are case sensitive (they are all lowercase) and have no
leading or trailing spaces. The tags have no attributes, i.e. no name=”value” within the tag.
4.6 Date and time
Date and time are tagged and shall use the convention specified in ISO 8601-1, e.g. time>2018-07-10T13:59:00+01
This data may be used for:
— date and time of sample registration;
— date and time when the results were produced;
— date and time when the results were validated;
— date and time when the report was issued.
4.7 Numeric datatype
The numeric datatype decimal (type xs: decimal or xs: float/ xs: double) shall be chosen. Numbers shall not
contain spaces and shall use a period as the decimal separator; they shall not use grouping of digits, i.e. no

ISO/FDIS 23219:2026(en)
thousands separator (e.g. comma). E-notation shall be used for powers of 10, e.g. 34, 12,3, −3,4567, 5,6E3 and
7,8E-2.
4.8 Units
Units shall use a single solidus or -exponent, e.g. MJ/m3 (see annexes), or MJ·m-3. Units shall not contain
spaces. Units should be considered case sensitive and case used e.g. to distinguish the International System
of Units prefixes of m (milli) and M (mega).
4.9 Component data
Component data shall be contained in blocks (see Annex A).
4.10 Components names
Component names shall use the InChI (International Chemical Identifier) used by the International Union
of Pure and Applied Chemistry (IUPAC). See Annex C for commonly used natural gas components. This is
unambiguous, reasonably concise, non-proprietary and, since the chemical formula is part of the InChI, it is
often clear what the component is. The alternative of using Chemical Abstracts Registry Number (CAS RN) is
not so understandable and is proprietary.
4.11 Properties
Properties shall be contained in a block, with each individual property in a separate
block. The property is identified with a keyword rather than by an XML tag (see Annex A).
4.12 Example keywords
Example keywords and units are given in Annex A.
In general, any keywords and units should be agreed between writing and reading applications.
Reading applications should ignore any keyword sections that are not relevant to their operation.
4.13 Checksum
The XML file shall have a checksum, e.g. CRC-16 check (hexadecimal) sum as displayed by ZIP programs,
at the end of the file as an XML comment, e.g. . This is not intended for security purposes,
merely as a confidence check that the file contents have not been corrupted.
4.14 Software
Software, capable of processing XML data to a spreadsheet editor and vice versa, is listed in Annex B.
5 General comments to keywords and units
5.1 Possible keywords and units are given in Annex A (see also example XML files on ISO Maintenance
Portal).
5.2 Example gas component names are specified in Annex C.
5.3 Amount units:
— The amount of substance may be expressed as a fraction or percentage with an appropriate multiple or
submultiple prefix.
— It should be indicated whether the amount fractions are normalised or non-normalised.

ISO/FDIS 23219:2026(en)
— Where volume-based concentration units (e.g. mg/m ) are used, the reference conditions for the volume
(i.e. pressure and temperature) and whether the volume amount includes the named component or not
shall be given in the units. When used for sulfur compound analyses, the reference conditions shall
be consistent with the corresponding ISO standards (ISO 19739), the normal reference conditions of
pressure, temperature and humidity (state of saturation) equal to 101,325 kPa and 273,15 K for a dry,
real gas.
NOTE Fraction or percent can be mole basis or mass basis.
5.4 For calorific value (CV), the following definitions should be used:
— gross CV is the same as superior CV and higher CV;
— net CV is the same as inferior CV and lower CV.
3 3
NOTE Common units for calorific value include MJ/m , kJ/mol, MJ/kg, Btu/ft .
Along with any physical properties, all necessary metadata should be included. For example, for ISO 6976,
this encompasses the metering and combustion temperatures, the pressure, and whether the properties are
real or ideal.
5.5 According to ISO/IEC Guide 98-3, every measurement should have an associated uncertainty.
Uncertainty shall be specified using the tag as an absolute value in the same units as the
measurement value (i.e. not as a relative percentage). The coverage factor for the uncertainty value shall
be specified using the tag. The form of the distribution may be specified using the
tag. If omitted, the distribution is assumed to be Normal (Gaussian).
5.6 For normalised compositions, the amount fractions shall sum to unity, hence there will always be
correlation between the amount fractions. The block is to allow for this.
NOTE See ISO 6976 for correlation matrix calculation.
5.7 Peak height and area have no need for units, only that the units should be consistent for that analyser
and analysis. Retention time units can be seconds or minutes.

ISO/FDIS 23219:2026(en)
Annex A
(normative)
XML tags
A.1 General
This annex provides descriptions of the elements of the XML file and includes an example of the XML schema.
These descriptions and examples are intended to assist in the implementation and validation of the XML
format.
The following example XML and CSV files are available for download at https:// standards .iso .org/ iso/ 23219/
ed -2/ en as optional adjuncts to this document:
— example of a gas certificate for composition analysis in machine readable format;
— example of composition analysis in machine readable format;
— example of gas composition and properties;
— example of a gas certificate for sulfur compound analysis in machine readable format;
— example of sulfur compound analysis.
A.2 Root element
The root element of the XML file is which contains the two main blocks, and
.
A.3
A.3.1
The measurements block contains all elements related to the analysis of a sample.
A.3.2
A.3.2.1
The parameters block contains elements used to describe the sample.
A.3.2.2
See 4.6.
A.3.2.3
Text description of cylinder number.
A.3.2.4
Text description of certificate number.

ISO/FDIS 23219:2026(en)
A.3.2.5
Text description of sample point.
A.3.2.6
Text description of sampling location.
A.3.3
A.3.3.1
The instrument block contains elements used to describe the instrument.
A.3.3.2
Text description of instrument type.
A.3.3.3
Text description of manufacturer.
A.3.3.4
Text description of serial_no.
A.3.3.5
Text description of id_no.
A.3.4
A.3.4.1
The method block contains elements used to describe the method used for the analysis.
A.3.4.2
Text description of the method name.
A.3.5
A.3.5.1
The peak blocks contain elements used to describe a peak in the chromatographic analysis, including
information about the component identification, quantitative results (the amounts) and chromatographic
information (retention time, peak area, etc.). A new peak block is used for each peak in the chromatogram.
A.3.5.2
A.3.5.2.1
The component block contains elements used to contain information about the identified component for the
chromatographic peak.
ISO/FDIS 23219:2026(en)
A.3.5.2.2
Text description of the component name.
A.3.5.2.3
a)
The parameters blocks contain elements used to further characterize the component. A new parameters
block is used for each property of the component. These component properties can be required for the
calculation of bulk properties of the sample.
b)
Text description of the property. Example names (and units) are provided in Table A.1.
Table A.1 — Example names and units
Names Units Remarks
molar_mass [kg/kmol]
boiling_point [K] (normal, at 101,325 kPa)
o
specific_gravity [-] (60/60 F relative density)
critical_temperature [K]
critical_pressure [MPa]
critical_volume [m /kmol]
critical_density [kg/m ]
acentric_factor [-]
Where the chemical formula of the component is needed for a calculation, this can be obtained from the
InChI element (see A.3.5.2.4).
c)
Numerical value of the property.
d)
Text description of the property units.
A.3.5.2.4
Text InChI descriptor of the component (see Annex C).
A.3.5.2.5
a)
The amount block contains elements used to contain the quantitative results of the analysis for the peak (the
amount of substance).
b)
Numerical value of the amount.
c)
1)
The units block contains elements used to describe the amount units.

ISO/FDIS 23219:2026(en)
2)
Text description of amount unit (see Clause 5).
3)
Text description of the basis of the units e.g. mole or mass can be required for amounts expressed as a
percentage.
4)
Text describing if amount fractions are normalised or non-normalised; can be true or false.
5)
i)
Optional block to describe the reference condition for volume-based units.
ii)
Numerical value of the reference pressure.
iii)
Text description of reference pressure units.
iv)
Numerical value of the reference temperature.
v)
Text description of reference temperature units.
d)
1)
The uncertainty block contains optional elements used to contain data for the component amount’s
uncertainty.
2)
Numerical value of the uncertainty.
3)
Numerical value, e.g. for a 95 % confidence interval of a normal distribution, the value is 1,96. This value
is often taken as 2.
4)
Text description of the distribution (see 5.5). If absent, assumed normal.
5)
Integer value. The number of measurements used in the calculation of .
6)
Integer value. Unique value for or .

ISO/FDIS 23219:2026(en)
A.3.5.3
Numerical value of the peak retention time.
A.3.5.4
Numerical value with arbitrary units (consistent throughout the file).
A.3.5.5
Numerical value with arbitrary units (consistent throughout the file).
A.3.6
A.3.6.1
Optional block to describe the correlation between amount fractions. See also 5.6. If absent, assumed to be
an identity matrix.
A.3.6.2
A.3.6.2.1
The element block contains values for each unique element in the correlation matrix.
A.3.6.2.2
Integer value. (Referenced by .)
A.3.6.2.3
Integer value. (Referenced by .)
A.3.6.2.4 >
Numerical value (in the range −1 to +1).
A.4
A.4.1
A.4.2
A.4.2.1
The method block contains elements related to a specific method used for properties calculation. Multiple
method blocks can be included if properties are calculated by different methods, e.g. ISO 6976 and ISO 20765.
A.4.2.2
Text description of the method used.

ISO/FDIS 23219:2026(en)
A.4.2.3
A.4.2.3.1
The parameters block contains elements for parameters that are relevant to the method. Examples are given
in A.4.2.3.2 to A.4.2.3.4.
A.4.2.3.2
Numerical value: <32 assumed oC, 32 to 100 assumed oF, >100 assumed K.
A.4.2.3.3
Numerical value: <32 assumed oC, 32 to 100 assumed oF, >100 assumed K.
A.4.2.3.4
Numerical value: >25 assumed kPa, <25 assumed psiA.
A.4.2.4
A.4.2.4.1
The property block contains elements describing the calculated property. Multiple property blocks can be
included.
A.4.2.4.2
Text description of the property. Example names (followed by possible units in [], and symbols) are given in
Table A.2.
Table A.2 — properties names and units
ISO 6976 properties Units Symbols
molar_mass [kg/kmol] M
gas_compression_factor [-] Z
volume_gross_calorific_value [MJ/m ] (Hv)
G
molar_gross_calorific_value [kJ/mol] (Hc)
G
mass_gross_calorific_value [MJ/kg] (Hm)
G
volume_net_calorific_value [MJ/m ] (Hv)
N
molar_net_calorific_value [kJ/mol] (Hc)
N
mass_net_calorific_value [MJ/kg] (Hm)
N
relative_density [-] G
gas_density [kg/m ] D
wobbe_index [MJ/m ] W
G
net_wobbe_index [MJ/m ] W
N
3 0
ideal_volume_gross_calorific_value [MJ/m ] (Hv)
G
3 0
ideal_volume_net_calorific_value [MJ/m ] (Hv)
N
ideal_relative_density [-] G
3 0
ideal_gas_density [kg/m ] D
3 0
ideal_wobbe_index [MJ/m ] W
G
3 0
ideal_net_wobbe_index [MJ/m ] W
N
ISO 20765-2 properties:
ISO/FDIS 23219:2026(en)
TTaabblle Ae A.2 2 ((ccoonnttiinnueuedd))
temperature [K] T
pressure [MPa] p
molar_helmholtz_free_energy [kJ/kmol] a
second_virial_coefficient [m /kmol] B
molar_isobaric_heat_capacity [kJ/kmol·K] c
p
molar_isochoric_heat_capacity [kJ/kmol·K] c
v
isochoric_heat_capacity [kJ/kg·K] C
v
isobaric_heat_capacity [kJ/kg·K] C
p
molar_density [kmol/m ] d ρ
density [kg/m ] D
molar_gibbs_free_energy [kJ/kmol] g
gibbs_free_energy [kJ/kg] G
molar_enthalpy [kJ/kmol] h
enthalpy [kJ/kg] H
molar_entropy [kJ/kmol·K] s
entropy [kJ/kg·K] S
molar_internal_energy [kJ/kmol] u
internal_energy [kJ/kg] U
molar_volume [m /kmol] v
speed_of_sound [m/s] w
compression_factor [-] Z
isothermal_throttling_coefficient [m /kmol] ϕ
isentropic_exponent [-] κ
joule-thomson_coefficient [K/MPa] μ
viscosity [mPa·s] η
A.4.2.4.3
Numerical value of the property.
A.4.2.4.4
Text description of property units.
A.4.2.4.5
a)
The uncertainty block contains elements used to contain data for the property’s uncertainty.
b)
Numerical value, in the same units as the property value.
c)
Numerical value. If absent, one (1) is assumed, i.e. uncertainty is the standard deviation.
d)
Text description of the distribution. If absent, normal is assumed.

ISO/FDIS 23219:2026(en)
e)
Optional text description of the method used for the uncertainty calculation.
A.5 XML schema (ISO23219.XSD)
This clause contains an example schema for the content outlined in this annex.
It is permissible to add other tags that can be useful for a specific case, e.g. extra data not considered here,
images and pictures.











maxOccurs="1"/>
maxOccurs="1"/>
maxOccurs="1"/>











ISO/FDIS 23219:2026(en)
maxOccurs="1"/>






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ISO/FDIS 23219:2026(en)
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ISO/TC 193
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Secretariat: NEN
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Date: 2026-02-2305-22
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Natural gas — Format for data from gas chromatograph analysers
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Gaz naturel — Format pour les données des analyseurs de chromatographie en phase gazeuse pour le gaz
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naturel — Format de fichier XML
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St l D fi iti
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, spacing: single
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Default Paragraph Font
at the address below or ISO’s member body in the country of the requester.
Formatted: Default Paragraph Font
ISO copyright office
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CP 401 • Ch. de Blandonnet 8
Header distance from edge: 1.27 cm, Footer distance
CH-1214 Vernier, Geneva
from edge: 0.5 cm
Phone: + 41 22 749 01 11
Fax: [phone]
EmailE-mail: [e-mail]
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Website: www.iso.orgwww.iso.org
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and numbers
Published in Switzerland
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ii
ISO/FDIS 23219:2026(en)
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Contents
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Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic instructions . 1
4.1 Syntax . 1
4.2 Element names . 1
4.3 Attributes . 2
4.4 Element data . 2
4.5 Schema . 2
4.6 Date and time . 2
4.7 Numeric datatype . 3
4.8 Units . 3
4.9 Component data . 3
4.10 Components names . 3
4.11 Properties . 3
4.12 Example keywords . 3
4.13 Checksum . 3
4.14 Software . 3
5 General comments to keywords and units . 4
Annex A (normative) XML tags . 5
Annex B (informative) Software suitable for XML file processing . 22
Annex C (informative) International Chemical Identifier (InChI) . 32
Bibliography . 35

Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic instructions . 1
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4.1 Syntax . 1
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4.2 Element names . 1
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4.5 Schema . 2
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4.6 Date and time . 2
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4.7 Numeric datatype . 2
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© ISO 2026 – All rights reserved
iii
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
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4.8 Units . 3
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4.9 Component data . 3
4.10 Components names . 3
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4.11 Properties . 3
spacing: single
4.12 Example keywords . 3
4.13 Checksum . 3
4.14 Software . 3
5 General comments to keywords and units . 3
Annex A (normative) XML tags . 5
A.1 General . 5
A.2 Root element . 5
A.3 . 5
A.4 . 9
A.5 XML schema (ISO23219.XSD) . 12
Annex B (informative) Software suitable for XML file processing . 19
B.1 General . 19
B.2 Example standalone code from a gas certificate . 19
B.3 Example Excel VBA code using the Microsoft Document Object Model (DOM) to read some of
the data . 22
Annex C (informative) International Chemical Identifier (InChI) . 25
Table C.1 — International Chemical Identifier (InChI) . 25
Bibliography . 28
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iv
ISO/FDIS 23219:2026(en)
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Foreword
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ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO /TC 193, Natural gas.
This second edition cancels and replaces the first edition (ISO 23219:2022), which has been technically
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revised.
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The main changes are as follows:
— — XML tags for the determination of sulfur compounds by gas chromatography have been added to the
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text and Annex A;Annex A;
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— — Annex B, Annex C and Annex D have been removed and converted into an XML file in the ISO
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Maintenance Portal in electronic format;
— — “Example of a gas certificate for sulfur compound analysis” and “Example of sulfur compound analysis”
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have been added to the ISO Maintenance Portal in electronic format;
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— — Annex BAnnex B has been updated based on the addition of XML tags for sulfur compound analysis;
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— — information on InChI for several sulfur compounds has been added to Annex C.Annex C.
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Any feedback or questions on this document should be directed to the user’s national standards body. A Formatted: FooterCentered, Left, Space Before: 0 pt,
complete listing of these bodies can be found at www.iso.org/members.html.www.iso.org/members.html. Tab stops: Not at 17.2 cm
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© ISO 2026 – All rights reserved
v
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
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Introduction
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There are multiple suppliers of analysers for the measurement of natural gas composition and sulfur
spacing: single
compounds. If correctly set up, there is no reason to prefer any one in particular, since they give comparable
results. However, this gives rise to a variety of methods of reporting data, which can create confusion over the
use of such data for offline calculation of properties or evaluation of analyser performance.
Therefore, a uniform method of data presentation, independent of the source of the analyser, as presented in
this document is considered valuable.
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vi
FINAL DRAFT International Standard ISO/FDIS 23219:2026(en)

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Natural gas — Format for data from gas chromatograph analysers for
and Asian text, Adjust space between Asian text and
natural gas — XML file format
numbers
1 Scope Formatted: Right: 1.5 cm, Bottom: 1 cm, Gutter: 0 cm,
Header distance from edge: 1.27 cm, Footer distance
from edge: 0.5 cm
This document specifies a text file format − XML file format − for reporting natural gas analysis results and
other data relevant to natural gas, natural gas substitutes and other combustible gaseous fuels. The file name
is applicable when it includes the extension of .XML (case insensitive).
The XML file format is useful for output from, for example, ISO 6974-1 for composition, ISO 19739 for sulfur
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compounds and ISO 6974-2 for uncertainty, as input for ISO 6976 for properties calculation or ISO 10723 for
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performance evaluation. Typically, these are the gas composition as provided on an analysis certificate. The
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format can also be used for the results of properties calculation or a performance evaluation that can be read
into a spreadsheet editor or data processing.
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2 Normative references
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The following documents are referred to in the text in such a way that some or all of their content constitutes
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requirements of this document. For dated references, only the edition cited applies. For undated references,
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the latest edition of the referenced document (including any amendments) applies.
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ISO 8601-1, Date and time — Representations for information interchange — Part 1: Basic rules
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ISO 8601-1, Date and time — Representations for information interchange — Part 1: Basic rules
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3 Terms and definitions
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No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
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— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
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stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
— — IEC Electropedia: available at https://www.electropedia.orghttps://www.electropedia.org
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
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4 Basic instructions
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4.1 Syntax
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XML is composed of a hierarchical structure of elements which contain text data.
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Elements are defined by an opening tag which comprises the element name enclosed in angular bracket, e.g.
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and a closing tag with / in front of the element name, e.g. .
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4.2 Element names
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Element names shall be lowercase (including inchi, which is usually written as InChI).
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Any multiple word element names shall be concatenated with underscore, e.g. .
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In general, element names should be complete words, rather short forms or acronyms.
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4.3 Attributes
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Tags shall not contain attributes, i.e. do not use:
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mg/m3
….


Instead, use:

391.043
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mg/m3 stops: Not at 0.71 cm
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….
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stops: Not at 0.71 cm

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The text content of elements, e.g. keywords, are case insensitive. Leading and trailing spaces are ignored.
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4.5 Schema
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The format of the XML file is defined in the schema given in Annex A.Annex A.
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The element names in the tags defined in the schema are case sensitive (they are all lowercase) and have no
Kingdom)
leading or trailing spaces. The tags have no attributes, i.e. no name=”value” within the tag.
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4.6 Date and time
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Date and time are tagged and shall use the convention specified in ISO 8601-1, e.g.
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2018-07-10T13:59:00+01
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3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
This data may be used for:
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— — date and time of sample registration;
spacing: single
ISO/FDIS 23219:2026(en)
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— — date and time when the results were produced;
— — date and time when the results were validated;
— — date and time when the report was issued.
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4.7 Numeric datatype
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The numeric datatype decimal (type xs:decimal or xs:float/xs:double) shall be chosen. Numbers shall not
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contain spaces and shall use a period as the decimal separator; they shall not use grouping of digits, i.e. no
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thousands separator (e.g. comma). E-notation shall be used for powers of 10, e.g. 34, 12,3, −3,4567, 5,6E3 and
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7,8E-2.
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4.8 Units
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Units shall use a single solidus or -exponent, e.g. MJ/m3 (see annexes), or MJ·m-3. Units shall not contain
spaces. Units should be considered case sensitive and case used e.g. to distinguish the International System of
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Units prefixes of m (milli) and M (mega).
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4.9 Component data
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Component data shall be contained in blocks (see Annex A).Annex A). Formatted: Adjust space between Latin and Asian text,
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4.10 Components names
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Component names shall use the InChI (International Chemical Identifier) used by the International Union of
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Pure and Applied Chemistry (IUPAC). See Annex CSee Annex C for commonly used natural gas components.
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This is unambiguous, reasonably concise, non-proprietary and, since the chemical formula is part of the InChI,
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it is often clear what the component is. The alternative of using Chemical Abstracts Registry Number (CAS RN)
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is not so understandable and is proprietary.
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4.11 Properties
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Properties shall be contained in a block, with each individual property in a separate
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block. The property is identified with a keyword rather than by an XML tag (see Annex A).Annex A).
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4.12 Example keywords
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Example keywords and units are given in Annex A.Annex A.
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In general, any keywords and units should be agreed between writing and reading applications.
Formatted
...
Formatted
...
Reading applications should ignore any keyword sections that are not relevant to their operation.
Formatted
...
4.13 Checksum
Formatted
...
Formatted
The XML file shall have a checksum, e.g. CRC-16 check (hexadecimal) sum as displayed by ZIP programs, at the .
end of the file as an XML comment, e.g. . This is not intended for security purposes, merely as
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a confidence check that the file contents have not been corrupted.
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4.14 Software Formatted: Font: 10 pt
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Software, capable of processing XML data to a spreadsheet editor and vice versa, is listed in Annex B.Annex B.
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© ISO 2026 – All rights reserved
ISO/FDIS 23219:2025(E2026(en) Formatted
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5 General comments to keywords and units
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5.1 5.1 Possible keywords and units are given in Annex AAnnex A (see also example XML files on ISO
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Maintenance Portal).
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5.2 5.2 Example gas component names are specified in Annex C.Annex C. Formatted
...
Formatted
...
5.3 5.3 Amount units:
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...
— — The amount of substance may be expressed as a fraction or percentage with an appropriate multiple
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...
or submultiple prefix.
Formatted
...
Formatted
— — It should be indicated whether the amount fractions are normalised or non-normalised.
...
Formatted
...
— — Where volume-based concentration units (e.g. mg/m ) are used, the reference conditions for the
Formatted
...
volume (i.e. pressure and temperature) and whether the volume amount includes the named component
or not shall be given in the units. When used for sulfur compound analyses, the reference conditions shall
be consistent with the corresponding ISO standards (ISO 19739), the normal reference conditions of
Formatted
...
pressure, temperature and humidity (state of saturation) equal to 101,325 kPa and 273,15 K for a dry, real
Formatted
...
gas.
Formatted
...
NOTE Fraction or percent can be mole basis or mass basis.
Formatted
...
5.4 5.4 For calorific value (CV), the following definitions should be used:
Formatted
...
Formatted
...
— — gross CV is the same as superior CV and higher CV;
Formatted
...
— — net CV is the same as inferior CV and lower CV.
Formatted
...
3 3
NOTE Common units for calorific value include MJ/m , kJ/mol, MJ/kg, Btu/ft . Formatted
...
Formatted
...
Along with any physical properties, all necessary metadata should be included. For example, for ISO 6976, this
Formatted
...
encompasses the metering and combustion temperatures, the pressure, and whether the properties are real
or ideal.
Formatted
...
Formatted
...
5.5 5.5 According to ISO/IEC Guide 98-3, every measurement should have an associated uncertainty.
Formatted
Uncertainty shall be specified using the tag as an absolute value in the same units as the
...
measurement value (i.e. not as a relative percentage). The coverage factor for the uncertainty value shall
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...
be specified using the tag. The form of the distribution may be specified using the
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...
tag. If omitted, the distribution is assumed to be Normal (Gaussian).
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5.6 5.6 For normalised compositions, the amount fractions shall sum to unity, hence there will always
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...
be correlation between the amount fractions. The block is to allow for this.
Formatted
...
NOTE See ISO 6976 for correlation matrix calculation.
Formatted
...
Formatted
5.7 5.7 Peak height and area have no need for units, only that the units should be consistent for that .
analyser and analysis. Retention time units can be seconds or minutes.
Formatted
...
Formatted
...
Formatted
...
Formatted
...
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...
ISO/FDIS 23219:2026(en)
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Annex A
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(normative)
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XML tags
A.1 General
This annex provides descriptions of the elements of the XML file and includes an example of the XML schema.
These descriptions and examples are intended to assist in the implementation and validation of the XML
format.
The following example XML and CSV files are available for download at
https://standards.iso.org/iso/23219/ed-2/enhttps://standards.iso.org/iso/23219/ed-2/en as optional
adjuncts to this document:
— — example of a gas certificate for composition analysis in machine readable format;
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— — example of composition analysis in machine readable format;
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — example of gas composition and properties;
— — example of a gas certificate for sulfur compound analysis in machine readable format;
— — example of sulfur compound analysis.
A.2 Root element
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The root element of the XML file is which contains the two main blocks, and
.
A.3
A.3.1
The measurements block contains all elements related to the analysis of a sample.
A.3.2
A.3.2.1
The parameters block contains elements used to describe the sample.
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See 4.6.
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See 4.6. Formatted: Font: 10 pt
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A.3.2.3
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Text description of cylinder number.
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© ISO 2026 – All rights reserved
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
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A.3.2.4
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Text description of certificate number.
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spacing: single
A.3.2.5
Text description of sample point.
A.3.2.6
Text description of sampling location.
A.3.3
A.3.3.1
The instrument block contains elements used to describe the instrument.
A.3.3.2
Text description of instrument type.
A.3.3.3
Text description of manufacturer.
A.3.3.4
Text description of serial_no.
A.3.3.5
Text description of id_no.
A.3.4
A.3.4.1
The method block contains elements used to describe the method used for the analysis.
A.3.4.2
Text description of the method name.
A.3.5
A.3.5.1
The peak blocks contain elements used to describe a peak in the chromatographic analysis, including
information about the component identification, quantitative results (the amounts) and chromatographic
information (retention time, peak area, etc.). A new peak block is used for each peak in the chromatogram.
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spacing: single
ISO/FDIS 23219:2026(en)
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A.3.5.2
A.3.5.2.1
The component block contains elements used to contain information about the identified component for the
Formatted: Numbered + Level: 1 + Numbering Style: a,
chromatographic peak.
b, c, … + Start at: 1 + Alignment: Left + Aligned at: 0
cm + Indent at: 0 cm, Adjust space between Latin and
A.3.5.2.2
Asian text, Adjust space between Asian text and
numbers
Text description of the component name.
Formatted
...
A.3.5.2.3 Formatted
...
Formatted
...
a) a)
Formatted
...
The parameters blocks contain elements used to further characterize the component. A new parameters block
Formatted: English (United Kingdom)
is used for each property of the component. These component properties can be required for the calculation
Formatted: English (United Kingdom)
of bulk properties of the sample.
Formatted: English (United Kingdom)
b) b)
Formatted
...
Formatted Table
Text description of the property. Example names (and units) are provided in Table A.1.Table A.1.
Formatted
...
Table A.1 — Example names and units
Formatted
...
Names Units Remarks
Formatted
...
Formatted
molar_mass [kg/kmol]
...
Formatted
boiling_point [K] (normal, at 101,325 kPa) .
o
Formatted
specific_gravity [-] (60/60 F relative density) .
Formatted
critical_temperature [K] .
Formatted
...
critical_pressure [MPa]
Formatted
3 .
critical_volume [m /kmol]
Formatted
3 .
critical_density [kg/m ]
Formatted
...
acentric_factor [-]
Formatted
...
Formatted
Where the chemical formula of the component is needed for a calculation, this can be obtained from the .
InChI element (see A.3.5.2.4).A.3.5.2.4).
Formatted
...
Formatted
...
c) c)
Formatted
...
Numerical value of the property.
Formatted
...
Formatted
d) d)
...
Formatted
...
Text description of the property units.
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A.3.5.2.4
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Formatted: Font: 10 pt
Text InChI descriptor of the component (see Annex C).Annex C).
Formatted
...
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Formatted
...
© ISO 2026 – All rights reserved
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
Formatted: Font: 11 pt, English (United Kingdom)
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A.3.5.2.5
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a) a)
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spacing: single
The amount block contains elements used to contain the quantitative results of the analysis for the peak (the
Formatted: Numbered + Level: 1 + Numbering Style: a,
amount of substance).
b, c, … + Start at: 1 + Alignment: Left + Aligned at: 0
cm + Indent at: 0 cm, Adjust space between Latin and
b) b)
Asian text, Adjust space between Asian text and
numbers
Numerical value of the amount.
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c) c)
Formatted
...
1) 1)
Formatted
...
Formatted
The units block contains elements used to describe the amount units. .
Formatted
...
2) 2)
Formatted
...
Text description of amount unit (see Clause 5).Clause 5). Formatted
...
Formatted
...
3) 3)
Formatted
...
Text description of the basis of the units e.g. mole or mass can be required for amounts expressed as a
Formatted
...
percentage.
4) 4)
Formatted
...
Text describing if amount fractions are normalised or non-normalised; can be true or false.
5) 5)
Formatted
...
i)
Formatted: Table body (+)
Optional block to describe the reference condition for volume-based units. Formatted Table
Formatted: Table body (+)
ii)
Formatted: Table body (+)
Numerical value of the reference pressure.
Formatted: Table body (+)
iii)
Formatted: Table body (+)
Text description of reference pressure units.
Formatted: Table body (+)
iv)
Formatted: Table body (+)
Numerical value of the reference temperature.
Formatted: Table body (+)
v)
Formatted: Table body (+)
Text description of reference temperature units.
Formatted: Table body (+)
d) d)
Formatted
...
Formatted
...
1) 1)
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Formatted
...
ISO/FDIS 23219:2026(en)
Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: Bold
Formatted: HeaderCentered, Left
The uncertainty block contains optional elements used to contain data for the component amount’s
uncertainty.
2) 2)
Formatted: Numbered + Level: 1 + Numbering Style: 1,
2, 3, … + Start at: 2 + Alignment: Left + Aligned at: 0
Numerical value of the uncertainty.
cm + Indent at: 0 cm
3) 3)
Formatted: Numbered + Level: 1 + Numbering Style: 1,
2, 3, … + Start at: 3 + Alignment: Left + Aligned at: 0
Numerical value, e.g. for a 95 % confidence interval of a normal distribution, the value is 1,96. This value
cm + Indent at: 0 cm
is often taken as 2.
4) 4)
Formatted: Numbered + Level: 1 + Numbering Style: 1,
2, 3, … + Start at: 4 + Alignment: Left + Aligned at: 0
Text description of the distribution (see 5.5).5.5). If absent, assumed normal.
cm + Indent at: 0 cm
5) 5)
Formatted: Numbered + Level: 1 + Numbering Style: 1,
2, 3, … + Start at: 5 + Alignment: Left + Aligned at: 0
Integer value. The number of measurements used in the calculation of .
cm + Indent at: 0 cm
6) 6)
Formatted: Numbered + Level: 1 + Numbering Style: 1,
2, 3, … + Start at: 6 + Alignment: Left + Aligned at: 0
Integer value. Unique value for or .
cm + Indent at: 0 cm
A.3.5.3
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Numerical value of the peak retention time.
A.3.5.4
Numerical value with arbitrary units (consistent throughout the file).
A.3.5.5
Numerical value with arbitrary units (consistent throughout the file).
A.3.6
A.3.6.1
Optional block to describe the correlation between amount fractions. See also 5.6.5.6. If absent, assumed to be
an identity matrix.
A.3.6.2
A.3.6.2.1
Formatted: Font: 10 pt
The element block contains values for each unique element in the correlation matrix.
Formatted: Font: 10 pt
A.3.6.2.2
Formatted: Font: 10 pt
Integer value. (Referenced by .) Formatted: FooterCentered, Left, Space Before: 0 pt,
Tab stops: Not at 17.2 cm
A.3.6.2.3
Formatted: Font: 11 pt
Formatted: FooterPageNumber, Left, Space After: 0 pt,
Integer value. (Referenced by .)
Tab stops: Not at 17.2 cm
© ISO 2026 – All rights reserved
ISO/FDIS 23219:2025(E2026(en) Formatted: Font: 11 pt, English (United Kingdom)
Formatted: Font: 11 pt, English (United Kingdom)
Formatted: Font: 11 pt, English (United Kingdom)
A.3.6.2.4 >
Formatted: Font: Bold
Numerical value (in the range −1 to +1).
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
A.4
A.4.1
The properties block contains
...