XML

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

The Standard Generalized Markup Language (SGML; ISO 8879:1986) is a standard for defining generalized markup languages for documents.

Wireless Markup Language (WML), based on XML, is a markup language intended for devices that implement the Wireless Application Protocol (WAP) specification, such as mobile phones.

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.

Office Open XML (also informally known as OOXML or OpenXML or earlier as MOX) is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents.

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.

UIML (User Interface Markup Language) is an XML-based user interface markup language for defining user interfaces on computers.

WAP Binary XML (WBXML) is a binary representation of XML.

XPointer is a system for addressing components of XML based Internet media.

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.

Simple Outline XML (SOX) is a compressed way of writing XML.

HyTime (Hypermedia/Time-based Structuring Language) is a markup language that is an application of SGML.

OIOXML is a project by the Danish government to develop a number of reusable data components serializable in various formats, although currently the only method of serialization for OIOXML data is in the XML format.

Arbortext Command Language, most-commonly referred to as ACL, is a scripting language for PTC's Arbortext software.

Plain Old XML (POX) is the basic XML, sometimes mixed in with other, blendable specifications like XML Namespaces, Dublin Core, XInclude and XLink.

Streaming XML is a synonym for dynamic data in XML format.

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.

Simple XML is a variation of XML containing only elements.

Each XML document has exactly one single root element.

UJML (Ujinn Markup Language) is a proprietary XML-based language created by UIEvolution.

The programming language XQuery defines FLWOR (pronounced 'flower') as an expression that supports iteration and binding of variables to intermediate results.