Extensible Markup Language (XML) is a data format
for structured document exchange. XML grew out of SGML. Like
SGML (and indeed HTML), anExtensible Markup Language (XML) document consists
of tags and text.
In XML, the document designer defines
the tags that are valid for that document, and assigns
their meanings. This is in contrast to HTML, where valid
tags and their meanings are fixed. The syntax of an
Extensible Markup Language (XML) document is specified in
an XML schema or XML DTD (XML document type definition).
Other topics in our resources on XML related to Extensible Markup Language include: