.. _functx_precedes-not-ancestor:

============================
functx:precedes-not-ancestor
============================ 

Whether an XML node precedes another without being its ancestor

Description
~~~~~~~~~~~
The functx:precedes-not-ancestor function returns a boolean value indicating 
whether $a precedes $b without being its ancestor. If either argument is the 
empty sequence the function returns false.

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   :widths: 40 60
   :header-rows: 1

   * - **Parameters**
     - **Description**
   * - a:node()
     - the first node
   * - b:node()
     - the second node

Examples
~~~~~~~~
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   :widths: 50 50
   :header-rows: 1

   * - **XPath**
     - **Results**
   * - functx:precedes-not-ancestor($in-xml//author[1],$in-xml//author[2])
     - true
   * - functx:precedes-not-ancestor($in-xml//author[1], $in-xml//author[1]/fName)
     - false
   * - functx:precedes-not-ancestor($in-xml//author[2],$in-xml//author[1])
     - false

See Also
~~~~~~~~

.. toctree::
   :titlesonly:
   :glob:

* :ref:`functx_follows-not-descendant`.
* :ref:`functx_first-node`.