.. _exists:

======
exists
====== 

Whether an argument is the empty sequence

Description
~~~~~~~~~~~
The fn:exists function returns true if the sequence contains one or more items; 
it is the opposite of the fn:empty function. It is often unnecessary to call the 
fn:exists function because sequences are automatically converted to the 
effective boolean value where a boolean value is expected.

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

   * - **Parameters**
     - **Description**
   * - arg:string()
     - 

Examples
~~~~~~~~
.. list-table::
   :widths: 50 50
   :header-rows: 1

   * - **XPath**
     - **Results**
   * - exists( ('a', 'b', 'c') )
     - true
   * - exists( '' )
     - true
   * - exists( () )
     - false
   * - exists( false() )
     - true

See Also
~~~~~~~~

.. toctree::
   :titlesonly:
   :glob:

* :ref:`empty`.
* :ref:`boolean`.