overloading definition in p:pipeline

What should be the behaviour of the XProc processor vis-à-vis the following
pipeline ?

<p:pipeline name="pipeline" xmlns:p="http://www.w3.org/ns/xproc">
  <p:input port="source" primary="true"/>
  <p:input port="schemas" sequence="true"/>
  :
</p:pipeline>

and vis-à-vis the following one ?

<p:pipeline name="pipeline" xmlns:p="http://www.w3.org/ns/xproc">
  <p:input port="source" primary="true" sequence="true"/>
  <p:input port="schemas" sequence="true"/>
  :
</p:pipeline>

and lastly vis-à-vis the following one ?

<p:pipeline name="pipeline" xmlns:p="http://www.w3.org/ns/xproc">
  <p:input port="source" primary="false" sequence="true"/>
  <p:input port="schemas" sequence="true"/>
  :
</p:pipeline>

Regards,

Mohamed


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