Root element of pipeline

I know this sounds dumb ... but I cant find this anywhere in the specs or 
even in the non-specs.
Is the root element of every XPROC document a <p:pipeline> element ?
Or is there cases where other elements could be considered valid roots ?
( ignoring the <p:library> element for now )

Thanks (especially for any pointers to the docs where this is obvious)

David A. Lee 

Received on Wednesday, 19 November 2008 16:53:38 UTC