fn:function-available
function-available($function-name as xs:string) ➔ xs:boolean
Determines whether a function with a given name (regardless of arity) is available in the context.
Arguments | |||
| $function-name | xs:string | The name of the requested function, as a lexical QName |
Result | xs:boolean | ||
function-available($function-name as xs:string, $arity as xs:integer) ➔ xs:boolean
Determines whether a function with the given name and arity is available in the context.
Arguments | |||
| $function-name | xs:string | The name of the requested function, as a lexical QName |
| $arity | xs:integer | The arity of the requested function (number of arguments) |
Result | xs:boolean | ||
Namespace
http://www.w3.org/2005/xpath-functions
Links to W3C specifications
Saxon availability
Available in XSLT 2.0 and later versions. Available in all Saxon editions. Available for all platforms.
Notes on the Saxon implementation
XPath 3.0 introduces the function function-lookup(), which returns null in
cases where function-available() would return false, but actually provides
access to the function in cases where function-available() would return true.