From canSAS

Help for XML

XML

EXtensible Markup Language
http://www.w3schools.com/xml/
http://www.w3.org/XML/
http://en.wikipedia.org/wiki/XML
http://www.zvon.org/xxl/XPathTutorial/General/examples.html

XSL (or XSLT)

EXtensible Stylesheet Language
http://www.w3schools.com/xsl/
http://www.w3.org/Style/XSL/
http://en.wikipedia.org/wiki/Extensible_Stylesheet_Language
http://en.wikipedia.org/wiki/XSLT

XPath

XPath is a language for finding information in an XML document.
http://www.w3schools.com/xpath/
http://www.w3.org/Style/XSL/
http://en.wikipedia.org/wiki/XPath

Schema

An XML Schema describes the structure of an XML document.
http://www.w3schools.com/schema/
http://www.w3.org/XML/Schema
http://en.wikipedia.org/wiki/XSD

XML Namespaces

XML namespaces are used for providing uniquely named elements and attributes in an XML instance.
http://www.zvon.org/xxl/NamespaceTutorial/Output
http://en.wikipedia.org/wiki/XML_namespaces
http://www.w3schools.com/XML/xml_namespaces.asp

XML Foreign Elements

Inclusion of elements, at select locations, that are not defined by the cansas1d.xsd XML Schema
http://books.xmlschemata.org/relaxng/relax-CHP-11-SECT-4.html
http://www.w3.org/TR/SVG/extend.html
http://www.google.com/search?q=XML+foreign+elements