Still puzzling over ports.

<p:declare-step xmlns:p="http://www.w3.org/ns/xproc"> <p:input port="source" primary='true' > <p:document href="doc.xml"/> </p:input> <p:output port="res" primary='true'> <p:pipe step='ident' port='result'/> <p:document href="op.xml"/> </p:output> <p:identity name='ident'/>

</p:declare-step>

Running this through Calabash,

Error : Pipeline failed: err:XS0030: null It is a static error to specify that more than one input port is the primary.

I can only see one port marked as primary?