ISO/IEC 13250-4:2009 PDF

Information technology — Topic Maps — Part 4: Canonicalization

Название (английский):

ISO/IEC 13250-4:2009

Information technology — Topic Maps — Part 4: Canonicalization

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 18 февраля 2009 г.
Издание:: ISO/IEC IS 13250 edition 1 version 1
ICS:: 35.240.30

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ISO/IEC 13250-4:2009 defines a format known as Canonical XTM, or CXTM for short. The format is an XML format, and has the property that it guarantees that two equivalent Topic Maps Data Model instances (ISO/IEC 13250-2) will always produce byte-by-byte identical serializations, and that non-equivalent instances will always produce different serializations. CXTM thus enables direct comparison of two topic maps to determine equality by comparison of their canonical serializations. The purpose of CXTM is to allow the creation of test suites for various Topic Maps-related technologies that are easily portable between different Topic Maps implementations, so long as these support CXTM. CXTM is not intended to be used for the interchange of topic maps, although this is possible. The standard format for interchange of topic maps is XTM (ISO/IEC 13250-3). ISO/IEC 13250-4:2009 specifies how CXTM files are produced from topic maps by means of a transformation from the Topic Maps Data Model (ISO/IEC 13250-2) to the XML Infoset.

Технические детали

Технический комитет: ISO/IEC JTC 1/SC 34 - Document description and processing languages
SKU: ISO/IEC 13250-4:2009

Abstract

Overview

ISO/IEC 13250-4:2009 defines Canonical XTM (CXTM) - an XML-based canonicalization format for Topic Maps. CXTM specifies how to transform a Topic Maps Data Model instance (ISO/IEC 13250-2) into an XML Infoset so that semantically equivalent topic maps always produce byte-for-byte identical serializations, and non-equivalent maps produce different serializations. The standard makes topic map equality decidable by simple file comparison and is primarily intended to support portable test suites across Topic Maps implementations.

Key topics and technical requirements

Canonicalization process:
- Input: a Topic Maps Data Model item and a base locator (used to normalize filesystem/URI references).
- Three main steps: produce a CXTM document information item, insert normalized character items/newlines per rules, then serialize using Canonical XML (XML-C14N).
Representation rules:
- Specific mappings from Topic Maps constructs (topicMap, topic, name, variant, occurrence, association, role, scope, itemIdentifiers, subjectLocators, subjectIdentifiers) to XML Infoset element information items.
- Attributes and children order are defined (including representation of reifier, item identifiers, type, value, datatype, and positional/number attributes).
Normalization and ordering:
- Canonical sort order rules determine deterministic ordering of topics, associations, variants, occurrences and locators.
- Locator normalization and string encoding rules (references to Unicode and XML Infoset) to ensure consistent byte-level output.
Interoperability constraints:
- CXTM is designed for testing and comparison, not as the primary interchange format. The standard interchange format remains XTM (ISO/IEC 13250-3).
Normative references include XML Infoset, XML-C14N, RFC 3986 (URI syntax), Unicode, and ISO/IEC 13250-2 (Topic Maps Data Model).

Applications and who should use it

Tool and library developers implementing Topic Maps engines who need deterministic serialization for:
- Automated conformance testing and regression tests.
- Portable test suites across different Topic Maps implementations.
- Verifying equivalence after transformations, merges, or round‑trip processing.
QA engineers, standards testers, and semantic web/knowledge‑management practitioners who require reliable, byte-for-byte comparisons of topic maps.
Not intended as the default interchange format for production data exchange - use XTM (ISO/IEC 13250-3) for interchange.

Related standards

ISO/IEC 13250-2: Topic Maps - Data model (required input model)
ISO/IEC 13250-3: XTM - XML Topic Maps (interchange syntax)
XML Infoset, XML-C14N (Canonical XML), RFC 3986 (URI), Unicode

Keywords: ISO/IEC 13250-4:2009, Canonical XTM, CXTM, Topic Maps, canonicalization, XML Infoset, Canonical XML, topic map canonical serialization, XTM, Topic Maps Data Model.

Overview

Key topics and technical requirements

Canonicalization process:
- Input: a Topic Maps Data Model item and a base locator (used to normalize filesystem/URI references).
- Three main steps: produce a CXTM document information item, insert normalized character items/newlines per rules, then serialize using Canonical XML (XML-C14N).
Representation rules:
- Specific mappings from Topic Maps constructs (topicMap, topic, name, variant, occurrence, association, role, scope, itemIdentifiers, subjectLocators, subjectIdentifiers) to XML Infoset element information items.
- Attributes and children order are defined (including representation of reifier, item identifiers, type, value, datatype, and positional/number attributes).
Normalization and ordering:
- Canonical sort order rules determine deterministic ordering of topics, associations, variants, occurrences and locators.
- Locator normalization and string encoding rules (references to Unicode and XML Infoset) to ensure consistent byte-level output.
Interoperability constraints:
- CXTM is designed for testing and comparison, not as the primary interchange format. The standard interchange format remains XTM (ISO/IEC 13250-3).
Normative references include XML Infoset, XML-C14N, RFC 3986 (URI syntax), Unicode, and ISO/IEC 13250-2 (Topic Maps Data Model).

Applications and who should use it

Tool and library developers implementing Topic Maps engines who need deterministic serialization for:
- Automated conformance testing and regression tests.
- Portable test suites across different Topic Maps implementations.
- Verifying equivalence after transformations, merges, or round‑trip processing.
QA engineers, standards testers, and semantic web/knowledge‑management practitioners who require reliable, byte-for-byte comparisons of topic maps.
Not intended as the default interchange format for production data exchange - use XTM (ISO/IEC 13250-3) for interchange.

Related standards

ISO/IEC 13250-2: Topic Maps - Data model (required input model)
ISO/IEC 13250-3: XTM - XML Topic Maps (interchange syntax)
XML Infoset, XML-C14N (Canonical XML), RFC 3986 (URI), Unicode

Keywords: ISO/IEC 13250-4:2009, Canonical XTM, CXTM, Topic Maps, canonicalization, XML Infoset, Canonical XML, topic map canonical serialization, XTM, Topic Maps Data Model.

ISO/IEC 13250-4:2009 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Похожие стандарты

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Похожие стандарты

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