I realized I did not answer your question, you probably referred to the schema validation. Here is a sample:

e.g. when a pipeline wants to modify the instance and also intends to pass over some data to the view, you have a parameter section like below:

   <p:param name="instance" type="input"/>
    <p:param name="data" type="output"/>
    <p:param name="instance" type="output"/>
and get a schema validation error: 'Duplicate key 'instance' for key or unique constraint [EMAIL PROTECTED]://www.orbeon.com/oxf/pipeline' on your problems list.

cheers,
Balázs

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