To edit an XQuery transformation:
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In the Routing Rules section, click the Select an existing mapper file or create a new one icon to the right of the Transform Using field. The Request Transformation Map dialog appears.
Note:
You cannot add or delete external variables from an existing XQuery (.xqy) map. However, you can select a variable and click Update Variable to modify the expression or value associated with the external variable.
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Click the Edit Mapping icon to the right of the Mapper File field. The XQuery map opens in the XQuery Mapper.
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See Creating Transformations with the XQuery Mapper for more information on using the XQuery Mapper.