Use the Custom XPath Function in Your Mashup or Macro

To use the function, you must add a namespace for the class that contains this function. Add an xmlns attribute with a unique namespace prefix to the <mashup> or <macro> tag. For example:

Then simply use the custom function in the XPath expressions where you need data to be normalized. In this example, the custom XPath expression is used in a <join> statement:

...
<input name="feed1" type="document">
<feed>
<Product>5-Year ARM</Product>
<Rate>5.250%</Rate>
<APR>5.388%</APR>
</feed>
</input>
<input name="feed2" type="document">
<feed>
<Product>5/1 Orange Mortgage</Product>
<Rate>5.500%</Rate>
<APR>4.872%</APR>
</feed>
</input>
<output name="result" type="document"/>
<join outputvariable="$result"
joincondition="$feed1/feed/finance:mortgage(Product) =
$feed2/feed/finance:mortgage(Product)"/>
<display message="result =" expr="$result"/>
....