XML-based standards

In markup languages, Schematron is a rule-based validation language for making assertions about the presence or absence of patterns in XML trees.

XML Linking Language, or XLink, is an XML markup language and W3C specification that provides methods for creating internal and external links within XML documents, and associating metadata with those links.

WDDX (Web Distributed Data eXchange) is a programming language-, platform- and transport-neutral data interchange mechanism designed to pass data between different environments and different computers.

The Document Object Model (DOM) is a cross-platform and language-independent application programming interface that treats an HTML, XHTML, or XML document as a tree structure wherein each node is an object representing a part of the document.

Mathematical Markup Language (MathML) is a mathematical markup language, an application of XML for describing mathematical notations and capturing both its structure and content.

The Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications originally designed as a metadata data model.

XForms is an XML format used for collecting inputs from web forms.

Extensible Hypertext Markup Language (XHTML) is part of the family of XML markup languages.

XSLT (Extensible Stylesheet Language Transformations) is a language for transforming XML documents into other XML documents, or other formats such as HTML for web pages, plain text or XSL Formatting Objects, which may subsequently be converted to other formats, such as PDF, PostScript and PNG.

In computing, the term Extensible Stylesheet Language (XSL) is used to refer to a family of languages used to transform and render XML documents.

The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies.

MARC (MAchine-Readable Cataloging) standards are a set of digital formats for the description of items catalogued by libraries, such as books.

XSD (XML Schema Definition), a recommendation of the World Wide Web Consortium (W3C), specifies how to formally describe the elements in an Extensible Markup Language (XML) document.

XSL-FO (XSL Formatting Objects) is a markup language for XML document formatting that is most often used to generate PDF files.

In computing, RELAX NG (REgular LAnguage for XML Next Generation) is a schema language for XML - a RELAX NG schema specifies a pattern for the structure and content of an XML document.

XBEL, or the XML Bookmark Exchange Language, is an open XML standard for sharing Internet URIs, also known as bookmarks (or favorites in Internet Explorer).

Metalink is an extensible metadata file format that describes one or more computer files available for download.

XRC, or XML Resource, or XML Based Resource System is a cross-platform XML-based user interface markup language used by wxWidgets.

Auto-lead Data Format (ADF) is an open XML-based standard specifically for communicating consumer purchase requests to automotive dealerships.

The Wave Federation Protocol (formerly Google Wave Federation Protocol) is an open protocol, extension of the Extensible Messaging and Presence Protocol (XMPP) that is used in Apache Wave.

Enterprise Privacy Authorization Language (EPAL) is a formal language for writing enterprise privacy policies to govern data handling practices in IT systems according to fine-grained positive and negative authorization rights.

The Microsoft Office XML formats are XML-based document formats (or XML schemas) introduced in versions of Microsoft Office prior to Office 2007.

FleXML is an XML transformation language originally developed by Kristofer Rose.

REgular LAnguage description for XML (RELAX) is a specification for describing XML-based languages.

Tree Regular Expressions for XML (TREX) is a simple schema language for XML.

The Binary Format Description (BFD) language is an extension of XSIL which has added conditionals and the ability to reference files by their stream numbers, rather than by their public URLs.

XUpdate is a lightweight XML query language for modifying XML data.

An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntactical constraints imposed by XML itself.

Music Markup Language (MML) is an XML application to describe music objects and events, using different modules and markup.

XSIL (Extensible Scientific Interchange Language) is an XML-based transport language for scientific data, supporting the inclusion of both in-file data and metadata.

Web Services Flow Language 1.

XDuce ("tranceduce") is an XML transformation language.

XML Script and XML-Script are two unrelated XML technologies.