Graphic technology - File format for quality control and metadata - Part 2: Print Quality eXchange (PQX)

This document specifies an extensible file format in conformity with W3C Extensible Markup Language (XML) 1.0, for the exchange of print quality data and metadata between quality control applications including but not limited to colour measurement, process control and quality management systems.

Technologie graphique - Format de fichier pour le contrôle qualité et les métadonnées - Partie 2: PQX (Print Quality eXchange)

Grafična tehnologija - Oblika datoteke za nadzor kakovosti in metapodatkov - 2. del: Izmenjava kakovosti tiskanja (PQX)

General Information

Status
Published
Publication Date
09-Jun-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Nov-2020
Due Date
14-Jan-2021
Completion Date
10-Jun-2021

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SLOVENSKI STANDARD
SIST ISO 20616-2:2021
01-julij-2021
Grafična tehnologija - Oblika datoteke za nadzor kakovosti in metapodatkov - 2.
del: Izmenjava kakovosti tiskanja (PQX)

Graphic technology - File format for quality control and metadata - Part 2: Print Quality

eXchange (PQX)

Technologie graphique - Format de fichier pour le contrôle qualité et les métadonnées -

Partie 2: PQX (Print Quality eXchange)
Ta slovenski standard je istoveten z: ISO 20616-2:2020
ICS:
35.240.30 Uporabniške rešitve IT v IT applications in information,
informatiki, dokumentiranju in documentation and
založništvu publishing
37.100.99 Drugi standardi v zvezi z Other standards related to
grafično tehnologijo graphic technology
SIST ISO 20616-2:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 20616-2:2021
---------------------- Page: 2 ----------------------
SIST ISO 20616-2:2021
INTERNATIONAL ISO
STANDARD 20616-2
First edition
2020-03
Graphic technology — File format for
quality control and metadata —
Part 2:
Print Quality eXchange (PQX)
Technologie graphique — Format de fichier pour le contrôle qualité
et les métadonnées —
Partie 2: PQX (Print Quality eXchange)
Reference number
ISO 20616-2:2020(E)
ISO 2020
---------------------- Page: 3 ----------------------
SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Requirements .......................................................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Extensibility ............................................................................................................................................................................................... 3

5.2.1 General...................................................................................................................................................................................... 3

5.2.2 TagCollection ....................................................................................................................................................................... 3

5.2.3 CustomResources ............................................................................................................................................................ 3

5.3 Employing CxF ......................................................................................................................................................................................... 3

5.4 PQX quality reporting ........................................................................................................................................................................ 4

5.4.1 Overview ................................................................................................................................................................................. 4

5.4.2 PQX element ......................................................................................................................................................................... 4

5.4.3 PQXInfo element............................................................................................................................................................... 4

5.4.4 PrinterInfo element ....................................................................................................................................................... 5

5.4.5 PressRunInfo element ................................................................................................................................................. 5

5.4.6 RunLength element ....................................................................................................................................................... 6

5.4.7 InkCollection/Ink element ...................................................................................................................................... 7

5.4.8 ReporterCollection/Reporter element ......................................................................................................... 7

5.4.9 QualityServiceProvider element ........................................................................................................................ 8

5.4.10 PrinterQA element .......................................................................................................................................................... 8

5.4.11 AutomatedPressControl element ...................................................................................................................... 9

5.4.12 CustomerItemCollection element ..................................................................................................................... 9

5.4.13 Customer element ........................................................................................................................................................10

5.4.14 SampleCollection element ....................................................................................................................................11

5.4.15 ColorReport element .................................................................................................................................................11

5.4.16 MeasurementSet element .....................................................................................................................................12

5.4.17 RegistrationReport element ................................................................................................................................14

5.4.18 VarianceReport element .........................................................................................................................................14

5.4.19 ChannelReport element ..........................................................................................................................................15

5.4.20 DefectReport/DefectSet element ....................................................................................................................16

5.4.21 DefectData element ....................................................................................................................................................17

5.4.22 BarcodeReport element ..........................................................................................................................................18

5.4.23 Barcode parameter reporting attribute ....................................................................................................18

5.4.24 Barcode1DEntry element ......................................................................................................................................18

5.4.25 Traditional1DVerification element ...............................................................................................................19

5.4.26 Barcode2DEntry element ......................................................................................................................................21

5.4.27 FPDDetails element ....................................................................................................................................................22

5.4.28 Traditional2DVerification element ...............................................................................................................23

5.4.29 CxFSampleData element ........................................................................................................................................25

5.4.30 CxFReferenceData element ..................................................................................................................................25

5.4.31 DefectImageData element .....................................................................................................................................25

5.4.32 TagCollection element ..............................................................................................................................................25

5.4.33 CustomResources element ...................................................................................................................................26

Annex A (normative) ISO 20616-2 XML schema ....................................................................................................................................27

Annex B (informative) PQX principles and concepts ........................................................................................................................28

Annex C (informative) Samples ...............................................................................................................................................................................30

Bibliography .............................................................................................................................................................................................................................33

© ISO 2020 – All rights reserved iii
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 130, Graphic technology.

A list of all parts in the ISO 20616 series can be found on the ISO website.

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 2020 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
Introduction

ISO 20616 defines standard XML schemas designed to enable the digital exchange of print quality data

and metadata between trading partners within the graphic arts supply chain. In the past, a number

of different non-standard data formats have been used to communicate print quality metrics. It is a

general observation that many of these existing non-standard data formats describe similar types of

information. Existing standard data formats cover either too much or too little scope to address industry

requirements. Hence, there is an industry need for a single, standard concise set of data formats for the

communication of print quality.

Each part of ISO 20616 is intended to stand alone, but may be used in conjunction with each other,

should that option be chosen. The goal of ISO 20616 is to maintain the degree of flexibility required by

print buyers for all kinds of print generated for all purposes from any print device while minimizing the

uncertainty of the data exchanged.

This document is intended to facilitate the one-way transmission of performance data for one or

more printed samples, for one or more brands or products from a single press run from print service

providers to relevant stakeholders and print buyers; thus, allowing them to assess and track relevant

business, production, colour and quality data of printed materials of all forms. PQX is only intended to

transmit raw quality data. The PQX file intentionally excludes tolerance and evaluative information,

allowing the receiver to determine acceptability by applying their own scale and tolerance values. PQX

incorporates colour using the same data containers that are defined in ISO 17972-4 (CxF3_Core.xsd).

While PQX and CxF are different formats with different parsing requirements, developers can use the

same strategies for reading and writing colour data in a PQX file that they use for reading and writing

colour data in a CxF file. PQX is compatible with both spectral and non-spectral colour data.

Some portions of this document are available as electronic files at http:// standards .iso .org/ iso/ 20616/

-2/ ed -1/ en
— ISO20616-2PQX.xsd

— ISO20616-2pqx_lines.pdf (a printable version of the PRX XML schema with reference line numbers)

— ISO20616-2SchemaDoc.pdf (Schema diagrams and documentation)
— PQX_MasterSampleA.pqx

— PQX_MasterSampleA.pdf (a printable version of Sample A with reference line numbers)

— PQX_MasterSampleB.pqx

— PQX_MasterSampleB.pdf (a printable version of Sample B with reference line numbers)

NOTE The spelling of fields in PQX were designed to match the spelling of fields taken from ISO 17972-1

and are not altered from that used in the normative reference. A specific example is the use of the word “color”

instead of “colour”.

It should be noted that Idealliance, Inc. the original creator of the PQX file format, claims no intellectual

property rights, neither patent nor copyright, to the materials used in this document.

© ISO 2020 – All rights reserved v
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SIST ISO 20616-2:2021
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SIST ISO 20616-2:2021
INTERNATIONAL STANDARD ISO 20616-2:2020(E)
Graphic technology — File format for quality control and
metadata —
Part 2:
Print Quality eXchange (PQX)
1 Scope

This document specifies an extensible file format in conformity with W3C Extensible Markup Language

(XML) 1.0, for the exchange of print quality data and metadata between quality control applications

including but not limited to colour measurement, process control and quality management systems.

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 17972-1, Graphic technology — Colour data exchange format — Part 1: Relationship to CxF3 (CxF/X)

ISO 17972-3, Graphic technology — Colour data exchange format (CxF/X) — Part 3: Output target data

(CxF/X-3)

Extensible Markup Language (XML) 1.0 (Fifth Edition), World Wide Web Consortium (W3C), W3C

Recommendation, 26 November 2008. Available at https:// www .w3 .org/ TR/ 2008/ REC -xml -20081126/

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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 http:// www .electropedia .org/
3.1
CxF

electronic exchange format for colour and process control data (and the associated metadata necessary

for its proper interpretation)
3.2
press run
continuous operation of a printing press for a single job
3.3
print buyer
name of the customer or entity purchasing printing services and products
3.4
print defect

imperfection that impairs worth or utility of a printed item that stems from a wide array of potential

causes and varies from printing method to printing method
© ISO 2020 – All rights reserved 1
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
3.5
printer

name of the print service provider responsible for printing items purchased by a print buyer (3.3)

3.6
XML
Extensible Markup Language

set of rules recommended by the World Wide Web Consortium (W3C) for encoding documents in a

digital format which is both human-readable and machine-readable
3.7
XML attribute
attribute

XML construct included within the start tag of an XML element (3.8) that modifies, or provides

descriptive metadata about, that element’s content
3.8
XML element
element

data structure including a start tag, an end tag, data between these tags, and, possibly, a set of XML

attributes (3.7)
[SOURCE: ISO 13584-32:2010, 3.22, modified — Added admitted term.]
3.9
XML root element
root element

single XML element that encloses all the other elements and is therefore the sole parent element to all

the other elements
3.10
XML schema

language for describing the structure and constraining the contents of XML documents

[SOURCE: ISO 25720:2009, 4.32]
3.11
XML schema parser

application that is capable of validating document schemes (content and structure) and descriptor data

types against their schema definition
[SOURCE: ISO/IEC 23001-1:2006, 3.2.71]
4 Symbols and abbreviated terms
The following documentation conventions are used.
— Names of XML elements are shown in bold type; for example, SampleCollection.
— Names of XML attributes are shown in italics; for example, @DisplayName.

XML XPaths are used to identify XML elements. For example, SampleCollection/Sample refers to an

element (Sample) that is a child of another element (SampleCollection).

Similarly, XML XPaths are used to refer to XML attributes. For example, CustomerItem/@Id refers to

an attribute (Id) of an element (CustomerItem).
2 © ISO 2020 – All rights reserved
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
5 Requirements
5.1 General

The following general requirements shall be met when using PQX XML to exchange print quality data

and metadata.

— The exchange of PQX print quality data and metadata shall conform to Extensible Markup Language

(XML) 1.0 (Fifth Edition).

— If PQX quality data are exchanged as a standalone file, the file extension shall be “.pqx”.

— The root element of ISO 20616-2 print quality data shall be a single PQX element.

— A valid PQX element shall contain the required namespace information in the root element: (

xmlns:p qx = ”http:// idealliance .org/ pqx” > ) followed by the XML elements and XML attributes

specified by ISO20616-2PQX.xsd.

— If colour quality data are being exchanged, the PQX root element shall contain the required

namespace information for CxF, “xmlns: cc = ”http:// colorexchangeformat .com/ CxF3 -core”.

PQX quality data should be validated using an XML schema parser employing the XML schema file

ISO20616-2PQX.xsd. The requirements for utilization of the ISO20616-1PQX schema shall be as specified

in Annex A.
5.2 Extensibility
5.2.1 General

To provide for extensibility for this document, the specification includes two blocks modelled directly

from the extensibility provided by CxF/X; TagCollection and CustomResources.
5.2.2 TagCollection

TagCollection may only be used to insert additional application-specific child elements into a PQX data

structure at the agreement of all trading partners. See 5.4.32.
NOTE Use of TagCollection is highly discouraged.
5.2.3 CustomResources

CustomResources may only be used to insert additional application-specific data models into a PQX

data structure at the agreement of all trading partners. See 5.4.33.
NOTE Use of CustomResources is highly discouraged.
5.3 Employing CxF

ISO 17972-1 shall be used to exchange print quality colour data and metadata. The following

requirements shall be met when using the CxF schema.

— Only Core CxF data shall be employed as the data store for colour requirements data.

— CxF shall be employed as a complete CxF hierarchy.

NOTE Retaining < c c: C x F > as the root element ensures direct importability from colour measurement

devices.

— CxF should only be used to customize CxF if specified by a business agreement among

trading partners.
© ISO 2020 – All rights reserved 3
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)

— CxF should only be used to customize CxF if specified by a business

agreement among trading partners.

— CxF < cc:P hysicalAttributes > < cc: C u s t om At t r ibut e S t r i n g > and < cc:

CustomAttributeValue > should only be used to customize CxF if specified by a business agreement

among trading partners.

— Non-appropriate CxF elements (listed above) may be written into a PQX quality report but should

only be processes by receiving systems if specified by a business agreement among trading partners.

5.4 PQX quality reporting
5.4.1 Overview

The ISO20616-2PQX schema provides the rules for the order, occurrence and datatypes for the fields that

make up a print quality report. The ISO20616-2PQX schema is the immutable specification. Additional

requirements that cannot be specified by an XML schema are found in the following subclauses.

NOTE A printable version of the ISO20616-2PQX schema with reference line numbers is available at http://

standards .iso .org/ iso/ 20616/ -2/ ed -1/ en) to enable referencing of element definitions by this document. See

Annexes B and C for additional information.
5.4.2 PQX element

The PQX element is the root element of a print quality data exchange. The PRX element shall be used

to specify a print buyer’s print quality report. The PQX element shall conform to rules specified by

ISO20616-2PQX.xsd (lines 10–30).

Table 1 provides for references to the specifications for fields that make up the PQX element.

Table 1 — PQX field specifications
Field name Normative specifications
PQXInfo See 5.4.3.
PrinterInfo See 5.4.4.
PressRunInfo See 5.4.5.
InkCollection See 5.4.6.
ReporterCollection See 5.4.8.
CustomerItemCollection See 5.4.10.
SampleCollection See 5.4.12.
CxFSampleData See 5.4.29.
CxFReferenceData See 5.4.30.
DefectImageData See 5.4.31.
TagCollection See 5.4.32.
CustomResources See 5.4.33.
5.4.3 PQXInfo element

The PQXInfo element shall be used to identify the instance of the print quality report being exchanged.

The PQXInfo element shall conform to rules specified by ISO20616-2PQX.xsd (lines 35–47). Table 2

provides definitions and usage rules for each child element of PQXInfo.
4 © ISO 2020 – All rights reserved
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
Table 2 — PQXInfo element definition and usage rules
Name Definition Usage rules
PQXDate The PQXDate element shall be used The PQXDate element shall conform to
to identify date or date/time this PQX rules specified by ISO20616–2PQX.xsd
data was generated. (lines 51–55).

PQXId The PQXId element shall be used to The PQXId element shall conform to rules

provide an identifier (unique in the specified by ISO20616–2PQX.xsd
context of system generated identifiers (lines 59–63).
assigned on the specified PQXDate) for
this print quality report.

PQXSoftware-Version PQXSoftware-Version shall be used to The PQXSoftware-Version element shall

identify the software and version that conform to rules specified by ISO20616–
generated this print quality report. 2PQX.xsd (lines 67–71).

NOTE Concatenation of the PQXDate, PQXId and PQXSoftware-Version can make up a unique identifier for this print

quality data report.
5.4.4 PrinterInfo element

The PrinterInfo element shall be used to identify information about the printer generating the print

quality report. The PrinterInfo element shall conform to rules specified by ISO20616-2PQX.xsd

(lines 245–258). Table 3 provides definitions and usage rules for each child element of PrinterInfo.

Table 3 — PrinterInfo definition and usage rules
Name Definition Usage rules

ParentCompany The ParentCompany element shall The ParentCompany element shall con-

be used to identify the company that form to rules specified by ISO20616–2PQX.
controls a smaller, entity such as a xsd (lines 155–159).
printer or quality service provider.

Printer The Printer element shall be used to The Printer element shall conform to

provide the name of the print service rules specified by ISO20616–2PQX.xsd
provider responsible for printing (lines 262–266).
items purchased by a print buyer.

LocationDesignator The LocationDesignator element The LocationDesignator element shall

shall be used to provide a designation conform to rules specified by ISO20616–
for the location of a company or party 2PQX.xsd (lines 171–175).
as a second level of identification for
that company or party.

ContactDesignator The ContactDesignator element The ContactDesignator element shall con-

shall be used to provide a designation form to rules specified by ISO20616–2PQX.
for information required to communi- xsd (lines 179–183).
cate with a business entity.

NOTE 1 LocationDesignator can be a unique identifier, city/state/country designation, postal code, geographic

coordinates or simply be a designator code employed by the printer. This element is purposefully flexible to facilitate broad

printer adoption.

NOTE 2 ContactDesignator can be email, street address, phone, fax, etc. or simply be a designator code employed by the

printer. This element is purposefully flexible to facilitate broad printer adoption.

5.4.5 PressRunInfo element

The PressRunInfo element shall be used to provide descriptive information about the press run. The

PressRunInfo element shall conform to rules specified by ISO20616-2PQX.xsd (lines 270–290). Table 4

provides definition and usage rules for each child element of PressRunInfo.
© ISO 2020 – All rights reserved 5
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SIST ISO 20616-2:2021
ISO 20616-2:2020(E)
Table 4 — PressRunInfo definition and usage rules
Name Definition Usage rules

DatePrinted The DatePrinted element shall be DatePrinted element shall conform to

used to s identify date or date/time rules specified by ISO20616–2PQX.xsd
this pressrun was conducted. (lines 294–298).

PrinterLotId The PrinterLotId element shall be The PrinterLotId element shall conform

used to provide the identifier used by to rules specified by ISO20616–2PQX.xsd
the printer for the press run. (lines 302–306).
RunLength See 5.4.6

PrintMethod The PrintMethod element shall be The PrintMethod element shall conform

used to specify the mechanism
...

INTERNATIONAL ISO
STANDARD 20616-2
First edition
2020-03
Graphic technology — File format for
quality control and metadata —
Part 2:
Print Quality eXchange (PQX)
Technologie graphique — Format de fichier pour le contrôle qualité
et les métadonnées —
Partie 2: PQX (Print Quality eXchange)
Reference number
ISO 20616-2:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 20616-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 20616-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Requirements .......................................................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Extensibility ............................................................................................................................................................................................... 3

5.2.1 General...................................................................................................................................................................................... 3

5.2.2 TagCollection ....................................................................................................................................................................... 3

5.2.3 CustomResources ............................................................................................................................................................ 3

5.3 Employing CxF ......................................................................................................................................................................................... 3

5.4 PQX quality reporting ........................................................................................................................................................................ 4

5.4.1 Overview ................................................................................................................................................................................. 4

5.4.2 PQX element ......................................................................................................................................................................... 4

5.4.3 PQXInfo element............................................................................................................................................................... 4

5.4.4 PrinterInfo element ....................................................................................................................................................... 5

5.4.5 PressRunInfo element ................................................................................................................................................. 5

5.4.6 RunLength element ....................................................................................................................................................... 6

5.4.7 InkCollection/Ink element ...................................................................................................................................... 7

5.4.8 ReporterCollection/Reporter element ......................................................................................................... 7

5.4.9 QualityServiceProvider element ........................................................................................................................ 8

5.4.10 PrinterQA element .......................................................................................................................................................... 8

5.4.11 AutomatedPressControl element ...................................................................................................................... 9

5.4.12 CustomerItemCollection element ..................................................................................................................... 9

5.4.13 Customer element ........................................................................................................................................................10

5.4.14 SampleCollection element ....................................................................................................................................11

5.4.15 ColorReport element .................................................................................................................................................11

5.4.16 MeasurementSet element .....................................................................................................................................12

5.4.17 RegistrationReport element ................................................................................................................................14

5.4.18 VarianceReport element .........................................................................................................................................14

5.4.19 ChannelReport element ..........................................................................................................................................15

5.4.20 DefectReport/DefectSet element ....................................................................................................................16

5.4.21 DefectData element ....................................................................................................................................................17

5.4.22 BarcodeReport element ..........................................................................................................................................18

5.4.23 Barcode parameter reporting attribute ....................................................................................................18

5.4.24 Barcode1DEntry element ......................................................................................................................................18

5.4.25 Traditional1DVerification element ...............................................................................................................19

5.4.26 Barcode2DEntry element ......................................................................................................................................21

5.4.27 FPDDetails element ....................................................................................................................................................22

5.4.28 Traditional2DVerification element ...............................................................................................................23

5.4.29 CxFSampleData element ........................................................................................................................................25

5.4.30 CxFReferenceData element ..................................................................................................................................25

5.4.31 DefectImageData element .....................................................................................................................................25

5.4.32 TagCollection element ..............................................................................................................................................25

5.4.33 CustomResources element ...................................................................................................................................26

Annex A (normative) ISO 20616-2 XML schema ....................................................................................................................................27

Annex B (informative) PQX principles and concepts ........................................................................................................................28

Annex C (informative) Samples ...............................................................................................................................................................................30

Bibliography .............................................................................................................................................................................................................................33

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 20616-2:2020(E)
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

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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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

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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 130, Graphic technology.

A list of all parts in the ISO 20616 series can be found on the ISO website.

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 2020 – All rights reserved
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ISO 20616-2:2020(E)
Introduction

ISO 20616 defines standard XML schemas designed to enable the digital exchange of print quality data

and metadata between trading partners within the graphic arts supply chain. In the past, a number

of different non-standard data formats have been used to communicate print quality metrics. It is a

general observation that many of these existing non-standard data formats describe similar types of

information. Existing standard data formats cover either too much or too little scope to address industry

requirements. Hence, there is an industry need for a single, standard concise set of data formats for the

communication of print quality.

Each part of ISO 20616 is intended to stand alone, but may be used in conjunction with each other,

should that option be chosen. The goal of ISO 20616 is to maintain the degree of flexibility required by

print buyers for all kinds of print generated for all purposes from any print device while minimizing the

uncertainty of the data exchanged.

This document is intended to facilitate the one-way transmission of performance data for one or

more printed samples, for one or more brands or products from a single press run from print service

providers to relevant stakeholders and print buyers; thus, allowing them to assess and track relevant

business, production, colour and quality data of printed materials of all forms. PQX is only intended to

transmit raw quality data. The PQX file intentionally excludes tolerance and evaluative information,

allowing the receiver to determine acceptability by applying their own scale and tolerance values. PQX

incorporates colour using the same data containers that are defined in ISO 17972-4 (CxF3_Core.xsd).

While PQX and CxF are different formats with different parsing requirements, developers can use the

same strategies for reading and writing colour data in a PQX file that they use for reading and writing

colour data in a CxF file. PQX is compatible with both spectral and non-spectral colour data.

Some portions of this document are available as electronic files at http:// standards .iso .org/ iso/ 20616/

-2/ ed -1/ en
— ISO20616-2PQX.xsd

— ISO20616-2pqx_lines.pdf (a printable version of the PRX XML schema with reference line numbers)

— ISO20616-2SchemaDoc.pdf (Schema diagrams and documentation)
— PQX_MasterSampleA.pqx

— PQX_MasterSampleA.pdf (a printable version of Sample A with reference line numbers)

— PQX_MasterSampleB.pqx

— PQX_MasterSampleB.pdf (a printable version of Sample B with reference line numbers)

NOTE The spelling of fields in PQX were designed to match the spelling of fields taken from ISO 17972-1

and are not altered from that used in the normative reference. A specific example is the use of the word “color”

instead of “colour”.

It should be noted that Idealliance, Inc. the original creator of the PQX file format, claims no intellectual

property rights, neither patent nor copyright, to the materials used in this document.

© ISO 2020 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20616-2:2020(E)
Graphic technology — File format for quality control and
metadata —
Part 2:
Print Quality eXchange (PQX)
1 Scope

This document specifies an extensible file format in conformity with W3C Extensible Markup Language

(XML) 1.0, for the exchange of print quality data and metadata between quality control applications

including but not limited to colour measurement, process control and quality management systems.

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 17972-1, Graphic technology — Colour data exchange format — Part 1: Relationship to CxF3 (CxF/X)

ISO 17972-3, Graphic technology — Colour data exchange format (CxF/X) — Part 3: Output target data

(CxF/X-3)

Extensible Markup Language (XML) 1.0 (Fifth Edition), World Wide Web Consortium (W3C), W3C

Recommendation, 26 November 2008. Available at https:// www .w3 .org/ TR/ 2008/ REC -xml -20081126/

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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 http:// www .electropedia .org/
3.1
CxF

electronic exchange format for colour and process control data (and the associated metadata necessary

for its proper interpretation)
3.2
press run
continuous operation of a printing press for a single job
3.3
print buyer
name of the customer or entity purchasing printing services and products
3.4
print defect

imperfection that impairs worth or utility of a printed item that stems from a wide array of potential

causes and varies from printing method to printing method
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ISO 20616-2:2020(E)
3.5
printer

name of the print service provider responsible for printing items purchased by a print buyer (3.3)

3.6
XML
Extensible Markup Language

set of rules recommended by the World Wide Web Consortium (W3C) for encoding documents in a

digital format which is both human-readable and machine-readable
3.7
XML attribute
attribute

XML construct included within the start tag of an XML element (3.8) that modifies, or provides

descriptive metadata about, that element’s content
3.8
XML element
element

data structure including a start tag, an end tag, data between these tags, and, possibly, a set of XML

attributes (3.7)
[SOURCE: ISO 13584-32:2010, 3.22, modified — Added admitted term.]
3.9
XML root element
root element

single XML element that encloses all the other elements and is therefore the sole parent element to all

the other elements
3.10
XML schema

language for describing the structure and constraining the contents of XML documents

[SOURCE: ISO 25720:2009, 4.32]
3.11
XML schema parser

application that is capable of validating document schemes (content and structure) and descriptor data

types against their schema definition
[SOURCE: ISO/IEC 23001-1:2006, 3.2.71]
4 Symbols and abbreviated terms
The following documentation conventions are used.
— Names of XML elements are shown in bold type; for example, SampleCollection.
— Names of XML attributes are shown in italics; for example, @DisplayName.

XML XPaths are used to identify XML elements. For example, SampleCollection/Sample refers to an

element (Sample) that is a child of another element (SampleCollection).

Similarly, XML XPaths are used to refer to XML attributes. For example, CustomerItem/@Id refers to

an attribute (Id) of an element (CustomerItem).
2 © ISO 2020 – All rights reserved
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ISO 20616-2:2020(E)
5 Requirements
5.1 General

The following general requirements shall be met when using PQX XML to exchange print quality data

and metadata.

— The exchange of PQX print quality data and metadata shall conform to Extensible Markup Language

(XML) 1.0 (Fifth Edition).

— If PQX quality data are exchanged as a standalone file, the file extension shall be “.pqx”.

— The root element of ISO 20616-2 print quality data shall be a single PQX element.

— A valid PQX element shall contain the required namespace information in the root element: (

xmlns:p qx = ”http:// idealliance .org/ pqx” > ) followed by the XML elements and XML attributes

specified by ISO20616-2PQX.xsd.

— If colour quality data are being exchanged, the PQX root element shall contain the required

namespace information for CxF, “xmlns: cc = ”http:// colorexchangeformat .com/ CxF3 -core”.

PQX quality data should be validated using an XML schema parser employing the XML schema file

ISO20616-2PQX.xsd. The requirements for utilization of the ISO20616-1PQX schema shall be as specified

in Annex A.
5.2 Extensibility
5.2.1 General

To provide for extensibility for this document, the specification includes two blocks modelled directly

from the extensibility provided by CxF/X; TagCollection and CustomResources.
5.2.2 TagCollection

TagCollection may only be used to insert additional application-specific child elements into a PQX data

structure at the agreement of all trading partners. See 5.4.32.
NOTE Use of TagCollection is highly discouraged.
5.2.3 CustomResources

CustomResources may only be used to insert additional application-specific data models into a PQX

data structure at the agreement of all trading partners. See 5.4.33.
NOTE Use of CustomResources is highly discouraged.
5.3 Employing CxF

ISO 17972-1 shall be used to exchange print quality colour data and metadata. The following

requirements shall be met when using the CxF schema.

— Only Core CxF data shall be employed as the data store for colour requirements data.

— CxF shall be employed as a complete CxF hierarchy.

NOTE Retaining < c c: C x F > as the root element ensures direct importability from colour measurement

devices.

— CxF should only be used to customize CxF if specified by a business agreement among

trading partners.
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ISO 20616-2:2020(E)

— CxF should only be used to customize CxF if specified by a business

agreement among trading partners.

— CxF < cc:P hysicalAttributes > < cc: C u s t om At t r ibut e S t r i n g > and < cc:

CustomAttributeValue > should only be used to customize CxF if specified by a business agreement

among trading partners.

— Non-appropriate CxF elements (listed above) may be written into a PQX quality report but should

only be processes by receiving systems if specified by a business agreement among trading partners.

5.4 PQX quality reporting
5.4.1 Overview

The ISO20616-2PQX schema provides the rules for the order, occurrence and datatypes for the fields that

make up a print quality report. The ISO20616-2PQX schema is the immutable specification. Additional

requirements that cannot be specified by an XML schema are found in the following subclauses.

NOTE A printable version of the ISO20616-2PQX schema with reference line numbers is available at http://

standards .iso .org/ iso/ 20616/ -2/ ed -1/ en) to enable referencing of element definitions by this document. See

Annexes B and C for additional information.
5.4.2 PQX element

The PQX element is the root element of a print quality data exchange. The PRX element shall be used

to specify a print buyer’s print quality report. The PQX element shall conform to rules specified by

ISO20616-2PQX.xsd (lines 10–30).

Table 1 provides for references to the specifications for fields that make up the PQX element.

Table 1 — PQX field specifications
Field name Normative specifications
PQXInfo See 5.4.3.
PrinterInfo See 5.4.4.
PressRunInfo See 5.4.5.
InkCollection See 5.4.6.
ReporterCollection See 5.4.8.
CustomerItemCollection See 5.4.10.
SampleCollection See 5.4.12.
CxFSampleData See 5.4.29.
CxFReferenceData See 5.4.30.
DefectImageData See 5.4.31.
TagCollection See 5.4.32.
CustomResources See 5.4.33.
5.4.3 PQXInfo element

The PQXInfo element shall be used to identify the instance of the print quality report being exchanged.

The PQXInfo element shall conform to rules specified by ISO20616-2PQX.xsd (lines 35–47). Table 2

provides definitions and usage rules for each child element of PQXInfo.
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ISO 20616-2:2020(E)
Table 2 — PQXInfo element definition and usage rules
Name Definition Usage rules
PQXDate The PQXDate element shall be used The PQXDate element shall conform to
to identify date or date/time this PQX rules specified by ISO20616–2PQX.xsd
data was generated. (lines 51–55).

PQXId The PQXId element shall be used to The PQXId element shall conform to rules

provide an identifier (unique in the specified by ISO20616–2PQX.xsd
context of system generated identifiers (lines 59–63).
assigned on the specified PQXDate) for
this print quality report.

PQXSoftware-Version PQXSoftware-Version shall be used to The PQXSoftware-Version element shall

identify the software and version that conform to rules specified by ISO20616–
generated this print quality report. 2PQX.xsd (lines 67–71).

NOTE Concatenation of the PQXDate, PQXId and PQXSoftware-Version can make up a unique identifier for this print

quality data report.
5.4.4 PrinterInfo element

The PrinterInfo element shall be used to identify information about the printer generating the print

quality report. The PrinterInfo element shall conform to rules specified by ISO20616-2PQX.xsd

(lines 245–258). Table 3 provides definitions and usage rules for each child element of PrinterInfo.

Table 3 — PrinterInfo definition and usage rules
Name Definition Usage rules

ParentCompany The ParentCompany element shall The ParentCompany element shall con-

be used to identify the company that form to rules specified by ISO20616–2PQX.
controls a smaller, entity such as a xsd (lines 155–159).
printer or quality service provider.

Printer The Printer element shall be used to The Printer element shall conform to

provide the name of the print service rules specified by ISO20616–2PQX.xsd
provider responsible for printing (lines 262–266).
items purchased by a print buyer.

LocationDesignator The LocationDesignator element The LocationDesignator element shall

shall be used to provide a designation conform to rules specified by ISO20616–
for the location of a company or party 2PQX.xsd (lines 171–175).
as a second level of identification for
that company or party.

ContactDesignator The ContactDesignator element The ContactDesignator element shall con-

shall be used to provide a designation form to rules specified by ISO20616–2PQX.
for information required to communi- xsd (lines 179–183).
cate with a business entity.

NOTE 1 LocationDesignator can be a unique identifier, city/state/country designation, postal code, geographic

coordinates or simply be a designator code employed by the printer. This element is purposefully flexible to facilitate broad

printer adoption.

NOTE 2 ContactDesignator can be email, street address, phone, fax, etc. or simply be a designator code employed by the

printer. This element is purposefully flexible to facilitate broad printer adoption.

5.4.5 PressRunInfo element

The PressRunInfo element shall be used to provide descriptive information about the press run. The

PressRunInfo element shall conform to rules specified by ISO20616-2PQX.xsd (lines 270–290). Table 4

provides definition and usage rules for each child element of PressRunInfo.
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ISO 20616-2:2020(E)
Table 4 — PressRunInfo definition and usage rules
Name Definition Usage rules

DatePrinted The DatePrinted element shall be DatePrinted element shall conform to

used to s identify date or date/time rules specified by ISO20616–2PQX.xsd
this pressrun was conducted. (lines 294–298).

PrinterLotId The PrinterLotId element shall be The PrinterLotId element shall conform

used to provide the identifier used by to rules specified by ISO20616–2PQX.xsd
the printer for the press run. (lines 302–306).
RunLength See 5.4.6

PrintMethod The PrintMethod element shall be The PrintMethod element shall conform

used to specify the mechanism by to rules specified by ISO20616–2PQX.xsd
which customer items were printed. (lines 335–339).

PrintSide The PrintSide element shall be used The PrintSide element shall conform to

to specify the side of the substrate rules specified by ISO20616–2PQX.xsd
where the customer image(s) is/are (lines 343–348).
printed.

PressLine The PressLine element shall be used The PressLine element shall conform to

to specify the line within a print shop rules specified by ISO20616–2PQX.xsd
where the press run took place. . (lines 352–356).

PressOperator The PressOperator element shall be The PressOperator element shall conform

used to identify the person running to rules specified by ISO20616–2PQX.xsd
the press. (lines 360–365).
Shift The Shift element shall be used to The Shift element shall conform to
specify the printer workforce period rules specified by ISO20616–2PQX.xsd
when the press run took place. (lines 369–373).

PrinterComments The PrinterComments element shall The PrinterComments element shall con-

be used to provide any additional form to rules specified by ISO20616–2PQX.
comments the printer may have about xsd (lines 377–381).
the press run.

PrinterJobDescription The PrinterJobDescription el- The PrinterJobDescription element shall

ement shall be used to provide a conform to rules specifi
...

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