Although .NET only supports XPath 1.0, our XForms engine has been extended to support a great number of XPath 2.0 functions.

XPath 2.0

The XPath 2.0 extension functions are available within the namespace http://www.w3.org/2005/xpath-functions.
Usually, the fn namespace prefix is declared and used for this namespace.

Accessor functions

• fn:node-name()
• fn:nilled()
• fn:string()
• fn:base-uri()

Functions on numerics

• fn:abs()
• fn:ceiling()
• fn:floor()
• fn:round()
• fn:round-half-to-even()

Functions on strings

• fn:compare()
• fn:concat()
• fn:string-join()
• fn:substring()
• fn:string-length()
• fn:normalize-space()
• fn:normalize-unicode()
• fn:upper-case()
• fn:lower-case()

Functions based on substring matching

• fn:contains()
• fn:starts-with()
• fn:ends-with()
• fn:substring-before()
• fn:substring-after()

String functions that use regular expressions

• fn:matches()
• fn:replace()

Functions related to QNames

• fn:resolve-QName()
• fn:QName()
• fn:prefix-from-QName()
• fn:local-name-from-QName()
• fn:namespace-uri-from-QName()
• fn:namespace-uri-for-prefix()

Functions on nodes

• fn:name()
• fn:local-name()
• fn:namespace-uri()