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A global variable is an alias association for a type and its value. Instead of using the function nodeValue("xpath") you may then use the global variable instead.

As an example. If you want to calculate a price like this:
nodeValue("/purchaseOrder/item/quantity") * nodeValue("/purchaseOrder/item/price")

You may use the following syntax after you have defined two global variables:
quantity * price

To define a variable you need to specify the following:

ParameterDescriptionExample
xpathXPath to address a node or a node list. Every referenced node will become a variable definition.
If you address nodes with an xpath selector like '//' or '//*' be sure that the node names are unique. Otherwise specify a name/value tuple where the name comes from another node.		/purchaseOrder/item/quantity
/item//*
//quantity
nameDefines the name and its value holder (optional) tag name (comma separated).
  • If no name is defined, the node tag name will be taken.
  • If just (withoud value holder name) a name is defined, the value is the direct child value of the target node (specified in xpath).
  • If a name and a value holder is defined, the name and the value holder name must be an existing direct child of the target node (specified in xpath).

Note: If you want the name or the value to be interpreted as a child node/child value you need to specify the variable as isDynamic = true.

myName
myName,myValue
namePrefix
(optional)		You may prefix all the var names if you like. This is optional but very powerfull if you know about duplicate node names.nl-1
nl-2
isDynamicIf you like to take the var name (and/or its value) from another node, be sure you mark the var as 'isDynamic'. Default is false.
If false the name of the variable is eather a fix name or if the name is empty the tag name of the target node will be taken.		true/false
   <var isDynamic="true">
              <name>../../../config/type/@name</name>
              <condition>nodeLabel(choosenNode(&quot;../../../config/type&quot;)) != &quot;raster&quot;</condition>
              <xpath>//page//element/value/simple/text()</xpath>
       </var>
       <var isDynamic="true">
              <name>./config/@name</name>
              <xpath>//page/UNNAMED1/group</xpath>
       </var>
       <var isDynamic="true">
              <name>../../../config/type/@name</name>
              <namePostfix>formula:pos()</namePostfix>
              <xpath>//page//element/value/list/sl</xpath>
       </var>
       <var isDynamic="true">
              <name>formula:&quot;../../../../config/type/table/column[&quot; + integer(subStringAfter(nodeName(&quot;.&quot;),,1)) + &quot;]/@name&quot;</name>
              <namePrefix>formula:nodeValue(&quot;../../../../config/type/@name&quot;)</namePrefix>
              <namePostfix>formula:pos()</namePostfix>
              <xpath>//page//element/value/list/*/*[starts-with(local-name(), &apos;c&apos;)]</xpath>
       </var>
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