Are pipelines in the same library visible to each other?

Is this legal:

<p:pipeline-library namespace="http://example.org/"
                     xmlns:ex="http://example.org/">
  <p:pipeline name="bar">
    ...
  </p:pipeline>

  <p:pipeline name="foo">
    <ex:bar/>
  </p:pipeline>
</p:pipeline-library>

Even if it is, do we agree that this is not?

<p:pipeline-library namespace="http://example.org/"
                     xmlns:ex="http://example.org/">
  <p:pipeline name="bar">
    <ex:foo/>
  </p:pipeline>

  <p:pipeline name="foo">
    ...
  </p:pipeline>
</p:pipeline-library>


                                        Be seeing you,
                                          norm

-- 
Norman Walsh
XML Standards Architect
Sun Microsystems, Inc.