.. _function-available:

==================
function-available
================== 

Whether a function is supported

Description
~~~~~~~~~~~
The fn:function-available function returns a boolean value indicating whether an 
implementation supports a particular function. All implementations support the 
built-in functions, but they may also support extension functions. Note: this is 
an XSLT-only function; it is not available in XQuery or XPath.

.. list-table::
   :widths: 40 60
   :header-rows: 1

   * - **Parameters**
     - **Description**
   * - function-name:string()
     - 
   * - arity:integer()
     -