ISO/IEC 24824-1:2007 PDF

Information technology — Generic applications of ASN.1: Fast infoset — Part 1:

First page of standard ISO/IEC 24824-1:2007

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Title (English):

ISO/IEC 24824-1:2007

Information technology — Generic applications of ASN.1: Fast infoset — Part 1:

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 91
Publication date:: May 4, 2007
Edition:: ISO/IEC IS 24824 edition 1 version 1
ICS:: 35.100.60

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Description (English):

ISO/IEC 24824-1:2007 specifies a representation of an instance of the W3C XML Information Set using binary encodings. These binary encodings are specified using the ASN.1 notation and the ASN.1 Encoding Control Notation (ECN). The technology specified in ISO/IEC 24824-1:2007 is called Fast Infoset. This technology provides an alternative to W3C XML syntax as a means of representing instances of the W3C XML Information Set. This representation generally provides smaller encoding sizes and faster processing than a W3C XML representation. ISO/IEC 24824-1:2007 specifies the use of several techniques that minimize the size of the encodings and that maximize the speed of creating and processing Fast Infoset documents. These techniques include the use of dynamic tables (for both character strings and qualified names), initial vocabularies and external vocabularies. ISO/IEC 24824-1:2007 also specifies a Multipurpose Internet Mail Extensions (MIME) media type that identifies a Fast Infoset document.

Technical details

Technical committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
SKU: ISO/IEC 24824-1:2007

Abstract

Overview

ISO/IEC 24824-1:2007 specifies Fast Infoset, a binary representation of the W3C XML Information Set. Using ASN.1 notation and ASN.1 Encoding Control Notation (ECN), Fast Infoset provides an alternative to textual XML that generally yields smaller encodings and faster processing. The standard defines the ASN.1 types, bit-level encodings, vocabulary mechanisms, and a MIME media type for Fast Infoset documents.

Key topics and technical requirements

Binary encoding of the XML infoset: Each Fast Infoset document encodes an abstract ASN.1 Document type representing the XML infoset.
ASN.1 + ECN definitions: ASN.1 modules and ECN modules included to specify exact binary formats and types.
Vocabulary tables: Use of dynamic string tables, element and attribute name tables, initial and external vocabularies to replace frequent strings with small integer indexes.
Restricted alphabets: Built-in restricted alphabets (e.g., numeric, date/time) allow compact character encoding when applicable.
Encoding algorithms: Built-in algorithms (e.g., hexadecimal, base64, integer, float, uuid, cdata) to encode common string forms efficiently.
Bit-level and octet alignment rules: Mix of octet-aligned components and compact, bit-level encodings for lengths and indexes to balance speed and compactness.
Optimization techniques: Name surrogates, dynamic name tables, and specialized encodings to minimize size and maximize parsing speed.
MIME registration: Standard specifies the Multipurpose Internet Mail Extensions media type that identifies a Fast Infoset document.
Normative annexes and examples: ASN.1/ECN modules, detailed encoding descriptions, bit-level encodings, and sample encodings (including UBL order examples).

Applications and who should use it

Fast Infoset is aimed at scenarios where reducing XML payload size and improving processing throughput are priorities:

High-performance messaging and web services (servers, clients, middleware)
Mobile and embedded systems where bandwidth and CPU are constrained
Real-time systems and high-throughput APIs that exchange XML infosets
Implementers building XML parsers, data-binding libraries, or binary-XML transports
Standards bodies and protocol designers who require interoperable binary XML formats

Adopting Fast Infoset can lead to reduced network usage and lower parsing overhead while preserving the expressiveness of the XML infoset model.

Related standards and keywords

Related parts: ISO/IEC 24824-2 (Fast Web Services); Part 3 (Fast Infoset Security) under preparation
Relevant specs: W3C XML Information Set, ASN.1, ISO/IEC 10646, ITU‑T Rec. X.891
SEO keywords: Fast Infoset, ISO/IEC 24824-1, binary XML, ASN.1 ECN, XML infoset, vocabulary tables, encoding algorithms, MIME Fast Infoset

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Binary encoding of the XML infoset: Each Fast Infoset document encodes an abstract ASN.1 Document type representing the XML infoset.
ASN.1 + ECN definitions: ASN.1 modules and ECN modules included to specify exact binary formats and types.
Vocabulary tables: Use of dynamic string tables, element and attribute name tables, initial and external vocabularies to replace frequent strings with small integer indexes.
Restricted alphabets: Built-in restricted alphabets (e.g., numeric, date/time) allow compact character encoding when applicable.
Encoding algorithms: Built-in algorithms (e.g., hexadecimal, base64, integer, float, uuid, cdata) to encode common string forms efficiently.
Bit-level and octet alignment rules: Mix of octet-aligned components and compact, bit-level encodings for lengths and indexes to balance speed and compactness.
Optimization techniques: Name surrogates, dynamic name tables, and specialized encodings to minimize size and maximize parsing speed.
MIME registration: Standard specifies the Multipurpose Internet Mail Extensions media type that identifies a Fast Infoset document.
Normative annexes and examples: ASN.1/ECN modules, detailed encoding descriptions, bit-level encodings, and sample encodings (including UBL order examples).

Applications and who should use it

Fast Infoset is aimed at scenarios where reducing XML payload size and improving processing throughput are priorities:

High-performance messaging and web services (servers, clients, middleware)
Mobile and embedded systems where bandwidth and CPU are constrained
Real-time systems and high-throughput APIs that exchange XML infosets
Implementers building XML parsers, data-binding libraries, or binary-XML transports
Standards bodies and protocol designers who require interoperable binary XML formats

Adopting Fast Infoset can lead to reduced network usage and lower parsing overhead while preserving the expressiveness of the XML infoset model.

Related standards and keywords

Related parts: ISO/IEC 24824-2 (Fast Web Services); Part 3 (Fast Infoset Security) under preparation
Relevant specs: W3C XML Information Set, ASN.1, ISO/IEC 10646, ITU‑T Rec. X.891
SEO keywords: Fast Infoset, ISO/IEC 24824-1, binary XML, ASN.1 ECN, XML infoset, vocabulary tables, encoding algorithms, MIME Fast Infoset

ISO/IEC 24824-1:2007 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards and keywords

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards and keywords

Related standards

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