From http://www.w3schools.com (Copyright Refsnes Data)

XML Related Technologies

Below is a list of XML technologies.

XHTML (Extensible HTML)
A stricter and cleaner XML based version of HTML.

XML DOM (XML Document Object Model)
A standard document model for accessing and manipulating XML.

XSL (Extensible Style Sheet Language) XSL consists of three parts:

• XSLT (XSL Transform) - transforms XML into other formats, like HTML
• XSL-FO (XSL Formatting Objects)- for formatting XML to screen, paper, etc
• XPath - a language for navigating XML documents

XQuery (XML Query Language)
An XML based language for querying XML data.

DTD (Document Type Definition)
A standard for defining the legal elements in an XML document.

XSD (XML Schema)
An XML-based alternative to DTD.

XLink (XML Linking Language)
A language for creating hyperlinks in XML documents.

XPointer (XML Pointer Language)
Allows the XLink hyperlinks to point to more specific parts in the XML document.

XForms (XML Forms)
Uses XML to define form data.

SOAP (Simple Object Access Protocol)
An XML-based protocol to let applications exchange information over HTTP.

WSDL (Web Services Description Language)
An XML-based language for describing web services.

RDF (Resource Description Framework)
An XML-based language for describing web resources.

RSS (Really Simple Syndication)
A format for syndicating news and the content of news-like sites.

WAP (Wireless Application Protocol)
A XML based language for displaying content on wireless clients, like mobile phones.

SMIL (Synchronized Multimedia Integration Language)
A language for describing audiovisual presentations.

SVG (Scalable Vector Graphics)
Defines graphics in XML format.

From http://www.w3schools.com (Copyright Refsnes Data)