Returns false if the node exists, else returns true.
The example below shows how you can use the not-exists function to map nodes that do not exist in one of a pair of source files.
What this mapping does:
|•||Compare the nodes of two source XML files|
|•||Filter out the nodes of the first source XML file, that do not exist in the second source XML file|
|•||Map only the missing nodes, and their content, to the target file.|
The two XML instance files are shown below, the differences between them are:
|•||a.xml (left) contains the node <b kind="3">, which is missing from b.xml.|
|•||b.xml (right) contains the node <b kind="4"> which is missing from a.xml.|
|•||The equal function compares the kind attribute of both XML files and passes the result to the filter.|
|•||A not-exists function is placed after the initial filter, to select the missing nodes of each of the source files.|
|•||The second filter is used to pass on the missing node and other data only from the a.xml file to the target.|
The mapping result is that the node missing from b.xml, <b kind="3">, is passed on to the target component.
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