XML and Related Acronyms
Document Type Definition (DTD), which defines the tags and their relationships
Extensible Style Language (XSL) style sheets, which specify the presentation of the document
Extensible Link Language (XLL), which defines link-handling details
Resource Description Framework (RDF), document metadata
Document Object Model (DOM), API for converting the document to a tree object in your program for processing and updating
Simple API for XML (SAX), “serial access” protocol, fast-to-execute protocol for processing document on the fly
XML Namespaces, for an environment of multiple sets of XML tags
XHTML, a definition of HTML tags for XML documents (which are then just HTML documents)
XML schema, to offer a more flexible alternative to DTD