RE: CR draft ready for review

> It's a p:pipeline, so it *does* declare parameters. From 4.1:
>  
>   The p:pipeline element is just a simplified form of step
>   declaration. A document that reads:
> 
>   <p:pipeline some-attributes>
>     some-content
>   </p:pipeline>
> 
>   can be interpreted as if it read:
> 
>   <p:declare-step some-attributes>
>     <p:input port='source' primary='true'/>
>     <p:input port='parameters' kind='parameters' primary='true'/>
>     <p:output port='result' primary='true'>
>     some-content
>   </p:declare-step>

So perhaps we should update 4.1 so that the first sentence of the second
paragraph says:

"All p:pipeline pipelines have an implicit primary input port named
'source', an implicit primary output port named 'result', and an
implicit primary parameter input port named 'parameters'."

Vojtech