Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 4: Bindings; Sub-part 1: Message delivery bindings

DEN/ESI-0019522-4-1

Elektronski podpisi in infrastruktura (ESI) - Storitve elektronske priporočene dostave - 4. del: Zaveze - 1. poddel: Zaveze za dostavo sporočil

Ta dokument določa zaveze glede sporočil ERD, katerih semantika je opredeljena v standardu ETSI EN 319 522-2 [1] in katerih format je opredeljen v standardu ETSI EN 319 522-3 [2], v povezavi s specifičnim protokolom prenosa AS4 [4].

General Information

Status
Published
Publication Date
04-Sep-2018
Current Stage
12 - Completion
Due Date
06-Sep-2018
Completion Date
05-Sep-2018

Buy Standard

Standard
EN 319 522-4-1 V1.1.1:2018
English language
10 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Standard
ETSI EN 319 522-4-1 V1.1.1 (2018-09) - Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 4: Bindings; Sub-part 1: Message delivery bindings
English language
10 pages
sale 15% off
Preview
sale 15% off
Preview
Standard
ETSI EN 319 522-4-1 V1.0.0 (2018-05) - Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 4: Bindings; Sub-part 1: Message delivery bindings
English language
10 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Electronic Signatures and Infrastructures (ESI) - Electronic Registered Delivery Services - Part 4: Bindings - Sub-part 1: Message delivery bindings35.040.01Kodiranje informacij na splošnoInformation coding in generalICS:Ta slovenski standard je istoveten z:ETSI EN 319 522-4-1 V1.1.1 (2018-09)SIST EN 319 522-4-1 V1.1.1:2018en01-november-2018SIST EN 319 522-4-1 V1.1.1:2018SLOVENSKI
STANDARD



SIST EN 319 522-4-1 V1.1.1:2018



ETSI EN 319 522-4-1 V1.1.1 (2018-09) Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 4: Bindings;
Sub-part 1: Message delivery bindings
EUROPEAN STANDARD SIST EN 319 522-4-1 V1.1.1:2018



ETSI ETSI EN 319 522-4-1 V1.1.1 (2018-09)2
Reference DEN/ESI-0019522-4-1 Keywords e-delivery services, registered e-delivery services, registered electronic mail ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice The present document can be downloaded from: http://www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https://portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2018. All rights reserved.
DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETM are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM® and the GSM logo are trademarks registered and owned by the GSM Association. SIST EN 319 522-4-1 V1.1.1:2018



ETSI ETSI EN 319 522-4-1 V1.1.1 (2018-09)3 Contents Intellectual Property Rights . 4 Foreword . 4 Modal verbs terminology . 4 1 Scope . 5 2 References . 5 2.1 Normative references . 5 2.2 Informative references . 5 3 Definitions and abbreviations . 6 3.1 Definitions . 6 3.2 Abbreviations . 6 4 Message delivery bindings - general concepts . 6 5 AS4 binding . 6 5.1 Introduction . 6 5.2 Generic requirements . 7 5.3 Signing and encryption of the AS4 message . 7 5.4 Binding of ERD dispatch . 8 5.5 Binding of ERDS receipt . 8 5.6 Binding of ERDS serviceInfo . 8 5.7 Binding of ERD payload . 8 6 IETF RFC 5322 binding . 9 History . 10
SIST EN 319 522-4-1 V1.1.1:2018



ETSI ETSI EN 319 522-4-1 V1.1.1 (2018-09)4 Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https://ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and Infrastructures (ESI). The present document is part 4, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in part 1 [i.3].
National transposition dates Date of adoption of this EN: 23 August 2018 Date of latest announcement of this EN (doa): 30 November 2018 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 May 2019 Date of withdrawal of any conflicting National Standard (dow): 31 May 2019
Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
SIST EN 319 522-4-1 V1.1.1:2018



ETSI ETSI EN 319 522-4-1 V1.1.1 (2018-09)5 1 Scope The present document defines the binding of the ERD messages, whose semantics is defined in ETSI EN 319 522-2 [1] and whose format is defined in ETSI EN 319 522-3 [2], to the specific transmission protocol AS4 [4]. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at https://docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. [1] ETSI EN 319 522-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 2: Semantic Contents". [2] ETSI EN 319 522-3: "Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 3: Formats". [3] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites". [4] OASIS: "AS4 Profile of ebMS 3.0 Version 1.0", OASIS Standard, January 2013. [5] W3C Recommendation: "XML Encryption Syntax and Processing Version 1.1", 11 April 2013. [6] ETSI EN 319 522-4-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered Delivery Services; Part 4: Bindings; Sub-part 2: Evidence and identification bindings". [7] ETSI EN 319 532-3: "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM) Services; Part 3: Formats". 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents a
...

ETSI EN 319 522-4-1 V1.1.1 (2018-09)






EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Electronic Registered Delivery Services;
Part 4: Bindings;
Sub-part 1: Message delivery bindings

---------------------- Page: 1 ----------------------
2 ETSI EN 319 522-4-1 V1.1.1 (2018-09)



Reference
DEN/ESI-0019522-4-1
Keywords
e-delivery services, registered e-delivery
services, registered electronic mail

ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2018.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 ETSI EN 319 522-4-1 V1.1.1 (2018-09)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Message delivery bindings - general concepts . 6
5 AS4 binding . 6
5.1 Introduction . 6
5.2 Generic requirements . 7
5.3 Signing and encryption of the AS4 message . 7
5.4 Binding of ERD dispatch . 8
5.5 Binding of ERDS receipt . 8
5.6 Binding of ERDS serviceInfo . 8
5.7 Binding of ERD payload . 8
6 IETF RFC 5322 binding . 9
History . 10


ETSI

---------------------- Page: 3 ----------------------
4 ETSI EN 319 522-4-1 V1.1.1 (2018-09)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI).
The present document is part 4, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
part 1 [i.3].

National transposition dates
Date of adoption of this EN: 23 August 2018
Date of latest announcement of this EN (doa): 30 November 2018
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2019
Date of withdrawal of any conflicting National Standard (dow): 31 May 2019

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI

---------------------- Page: 4 ----------------------
5 ETSI EN 319 522-4-1 V1.1.1 (2018-09)
1 Scope
The present document defines the binding of the ERD messages, whose semantics is defined in ETSI EN 319 522-2 [1]
and whose format is defined in ETSI EN 319 522-3 [2], to the specific transmission protocol AS4 [4].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 319 522-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 2: Semantic Contents".
[2] ETSI EN 319 522-3: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 3: Formats".
[3] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[4] OASIS: "AS4 Profile of ebMS 3.0 Version 1.0", OASIS Standard, January 2013.
[5] W3C Recommendation: "XML Encryption Syntax and Processing Version 1.1", 11 April 2013.
[6] ETSI EN 319 522-4-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 4: Bindings; Sub-part 2: Evidence and identification bindings".
[7] ETSI EN 319 532-3: "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail
(REM) Services; Part 3: Formats".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] IETF RFC 5322: "Internet Message Format".
[i.2] OASIS: "Web Services Security X.509 Certificate Token Profile 1.1. OASIS Standard
incorporating Approve
...

Draft ETSI EN 319 522-4-1 V1.0.0 (2018-05)






EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Electronic Registered Delivery Services;
Part 4: Bindings;
Sub-part 1: Message delivery bindings

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 319 522-4-1 V1.0.0 (2018-05)



Reference
DEN/ESI-0019522-4-1
Keywords
e-delivery services, registered e-delivery
services, registered electronic mail

ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2018.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 319 522-4-1 V1.0.0 (2018-05)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Message delivery bindings - general concepts . 6
5 AS4 binding . 6
5.1 Introduction . 6
5.2 Generic requirements . 7
5.3 Signing and encryption of the AS4 message . 7
5.4 Binding of ERD dispatch . 8
5.5 Binding of ERDS receipt . 8
5.6 Binding of ERDS serviceInfo . 8
5.7 Binding of ERD payload . 8
6 IETF RFC 5322 binding . 9
History . 10


ETSI

---------------------- Page: 3 ----------------------
4 Draft ETSI EN 319 522-4-1 V1.0.0 (2018-05)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN
Approval Procedure.
The present document is part 4, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
part 1 [i.3].

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI

---------------------- Page: 4 ----------------------
5 Draft ETSI EN 319 522-4-1 V1.0.0 (2018-05)
1 Scope
The present document defines the binding of the ERD messages, whose semantics is defined in ETSI EN 319 522-2 [1]
and whose format is defined in ETSI EN 319 522-3 [2], to the specific transmission protocol AS4 [4].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 319 522-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 2: Semantic Contents".
[2] ETSI EN 319 522-3: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 3: Formats".
[3] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[4] OASIS: "AS4 Profile of ebMS 3.0 Version 1.0", OASIS Standard, January 2013.
[5] W3C Recommendation: "XML Encryption Syntax and Processing Version 1.1", 11 April 2013.
[6] ETSI EN 319 522-4-2: "Electronic Signatures and Infrastructures (ESI); Electronic Registered
Delivery Services; Part 4: Bindings; Sub-part 2: Evidence and identification bindings".
[7] ETSI EN 319 532-3: "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail
(REM) Services; Part 3: Formats".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] IETF RFC 5322: "Internet Message Format".
[i.2] OASIS: "Web Services Security X.5
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.