.. _functx_add-or-update-attributes:

===============================
functx:add-or-update-attributes
=============================== 

Adds attributes to XML elements

Description
~~~~~~~~~~~
The functx:add-or-update-attributes function takes one or more XML element 
nodes, along with a sequence of attribute names and a sequence of attribute 
values, and returns a newly constructed element with those attributes added. The 
attribute names and values are positionally related, i.e. the first attribute 
name corresponds to the first attribute value, the second name to the second 
value, etc. It leaves all the original attributes and content of the element, 
except that if it already has an attribute with the same name of one of 
$attrNames, its value is updated to match the corresponding value in 
$attrValues. This is in contrast with the functx:add-attributes function, which 
will not update the value.

Each name must be specified as an xs:QName value. QNames can be constructed with 
calls to the xs:QName type constructor or the fn:QName function, as shown in the 
examples.

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

   * - **Parameters**
     - **Description**
   * - elements:element()
     - the element(s) to which you wish to add the attribute
   * - attrNames:string()
     - the name(s) of the attribute(s) to add
   * - attrValues:string()
     - the value(s) of the attribute(s) to add

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

   * - **XPath**
     - **Results**
   * - 
     - 
   * - 
     - 
   * - functx:add-or-update-attributes($in-xml/b, (xs:QName('att1'),xs:QName('att2')), (1,2))
     - <b att1="1" att2="2">x</b>
   * - functx:add-or-update-attributes($in-xml/a, xs:QName('new:att1'), 1)
     - <a xmlns:new="http://new" new:att1="1">x</a>
   * - functx:add-or-update-attributes($in-xml/a, QName('http://new','new:att1'), 1)
     - <a xmlns:new="http://new" new:att1="1">x</a>

See Also
~~~~~~~~

.. toctree::
   :titlesonly:
   :glob:

* :ref:`functx_add-attributes`.
* :ref:`functx_update-attributes`.
* :ref:`functx_copy-attributes`.
* :ref:`functx_remove-attributes`.