XML website screenshot

XML

XML (Extensible Markup Language) is a W3C standard markup language and data format that defines rules for encoding documents in a way that is both human-readable and machine-readable. Originally published as a W3C Recommendation in 1998 (XML 1.0), XML provides the foundation for a wide ecosystem of related standards including XML Schema, XSLT, XPath, XQuery, SOAP, XHTML, SVG, RSS, Atom, and many domain-specific vocabularies. XML remains a core data interchange format for enterprise systems, web services, configuration, and document publishing.

4 APIs 0 Features
Data FormatsDocumentMarkup LanguageStandardW3CWeb ServicesXML

APIs

XML 1.0

Extensible Markup Language (XML) 1.0 is the foundational W3C Recommendation defining the syntax and processing model for XML documents. First published in 1998 and now in its Fi...

XML 1.1

Extensible Markup Language (XML) 1.1 is a W3C Recommendation published in 2006 that extends XML 1.0 to support newer Unicode versions, additional line ending characters, and a b...

XML Namespaces

Namespaces in XML 1.0 (Third Edition) is the W3C Recommendation that defines a mechanism for qualifying element and attribute names in XML documents using URI references. XML Na...

XML Schema (XSD)

XML Schema Definition Language (XSD) is the W3C Recommendation for describing the structure and constraints of XML documents using an XML-based grammar. XSD 1.1 is the current v...

Pricing Plans

Xml Plans Pricing

3 plans

PLANS

Rate Limits

Xml Rate Limits

5 limits

RATE LIMITS

FinOps

Xml Finops

FINOPS

Semantic Vocabularies

Xml Context

0 classes · 36 properties

JSON-LD

JSON Structure

Xml Document Structure

5 properties

JSON STRUCTURE

Example Payloads

Xml Document Example

11 fields

EXAMPLE

Xml Element Example

8 fields

EXAMPLE

Resources

🔗
DomainSecurity
DomainSecurity
🔗
Website
Website
🔗
Documentation
Documentation
🔗
Specification
Specification
👥
GitHubOrganization
GitHubOrganization
👥
GitHubRepository
GitHubRepository
🔗
JSONSchema
JSONSchema
🔗
JSONSchema
JSONSchema
🔗
JSONStructure
JSONStructure
🔗
JSONLDContext
JSONLDContext
🔗
Vocabulary
Vocabulary

Sources

apis.yml Raw ↑ 
aid: xml
name: XML
description: XML (Extensible Markup Language) is a W3C standard markup language and data format that defines rules for encoding
  documents in a way that is both human-readable and machine-readable. Originally published as a W3C Recommendation in 1998
  (XML 1.0), XML provides the foundation for a wide ecosystem of related standards including XML Schema, XSLT, XPath, XQuery,
  SOAP, XHTML, SVG, RSS, Atom, and many domain-specific vocabularies. XML remains a core data interchange format for enterprise
  systems, web services, configuration, and document publishing.
type: Index
url: https://www.w3.org/XML/
tags:
- Data Formats
- Document
- Markup Language
- Standard
- W3C
- Web Services
- XML
created: '2025'
modified: '2026-05-03'
specificationVersion: '0.19'
apis:
- aid: xml:xml-10
  name: XML 1.0
  description: Extensible Markup Language (XML) 1.0 is the foundational W3C Recommendation defining the syntax and processing
    model for XML documents. First published in 1998 and now in its Fifth Edition (2008), XML 1.0 specifies well-formedness,
    validity, character encoding, and the basic constructs (elements, attributes, namespaces, processing instructions, comments,
    and entities) that all XML technologies build upon.
  humanURL: https://www.w3.org/TR/xml/
  tags:
  - Document
  - Markup Language
  - Standard
  - W3C
  - XML
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/xml/
  - type: Specification
    url: https://www.w3.org/TR/xml/
- aid: xml:xml-11
  name: XML 1.1
  description: Extensible Markup Language (XML) 1.1 is a W3C Recommendation published in 2006 that extends XML 1.0 to support
    newer Unicode versions, additional line ending characters, and a broader set of name characters. XML 1.1 is rarely deployed
    in practice; XML 1.0 remains the dominant version used in production systems.
  humanURL: https://www.w3.org/TR/xml11/
  tags:
  - Document
  - Markup Language
  - Standard
  - W3C
  - XML
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/xml11/
  - type: Specification
    url: https://www.w3.org/TR/xml11/
- aid: xml:xml-namespaces
  name: XML Namespaces
  description: Namespaces in XML 1.0 (Third Edition) is the W3C Recommendation that defines a mechanism for qualifying element
    and attribute names in XML documents using URI references. XML Namespaces allow vocabularies from different sources to
    be combined in a single document without naming collisions, and underpin every modern XML application including XHTML,
    SOAP, XSLT, and SVG.
  humanURL: https://www.w3.org/TR/xml-names/
  tags:
  - Namespaces
  - Standard
  - W3C
  - XML
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/xml-names/
  - type: Specification
    url: https://www.w3.org/TR/xml-names/
- aid: xml:xml-schema
  name: XML Schema (XSD)
  description: XML Schema Definition Language (XSD) is the W3C Recommendation for describing the structure and constraints
    of XML documents using an XML-based grammar. XSD 1.1 is the current version and provides element/attribute declarations,
    complex and simple types, keys/keyrefs, assertions, and conditional type assignment.
  humanURL: https://www.w3.org/XML/Schema
  tags:
  - Schema
  - Standard
  - Validation
  - W3C
  - XML
  properties:
  - type: Documentation
    url: https://www.w3.org/XML/Schema
  - type: Specification
    url: https://www.w3.org/TR/xmlschema11-1/
common:
- type: DomainSecurity
  url: security/xml-domain-security.yml
- type: Website
  url: https://www.w3.org/XML/
- type: Documentation
  url: https://www.w3.org/TR/xml/
- type: Specification
  url: https://www.w3.org/TR/xml/
- type: GitHubOrganization
  url: https://github.com/w3c
- type: GitHubRepository
  url: https://github.com/w3c/xml
- type: JSONSchema
  url: https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/json-schema/xml-document-schema.json
- type: JSONSchema
  url: https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/json-schema/xml-element-schema.json
- type: JSONStructure
  url: https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/json-structure/xml-document-structure.json
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/json-ld/xml-context.jsonld
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/vocabulary/xml-vocabulary.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com