function-available Function

Returns True if the function is in the function library.

boolean function-available(string)

Remarks

The argument must evaluate to a string that is a QName. The QName is expanded into an expanded-name using the namespace declarations in scope for the expression. The function-available function returns True if and only if the expanded-name is the name of a function in the function library. If the expanded-name has a non-null namespace URI, it refers to an extension function; otherwise, it refers to a function defined by XPath or XSLT.

Example

The following function call returns True:

function-available("format-number")

See Also

XML Data Types Reference