Allow @namespace on p:pipeline

In order to allow pipelines to be defined in a namespace even when
they are not part of a library (as well as allowing a library to
contain pipelines from more than one namespace), I think we should
allow the namespace attribute on p:pipeline (with the semantics of
@namespace on p:pipeline-library).

Several recent messages have included examples of the form:

  <p:pipeline name="xx:name" xmlns:xx="http://www.example.com/ns/xx">
  ...
  </p:pipeline>

but that's an error. At the moment, you'd need:

  <p:pipeline-library namespace="http://www.example.com/ns/xx">
    <p:pipeline name="name">
      ...
    </p:pipeline>
  </p:pipeline-library>

but I think we should allows this as well[*]:

  <p:pipeline name="name" namespace="http://www.example.com/ns/xx">

                                        Be seeing you,
                                          norm

[*] Truth be told, I think we should just allow name to be a QName,
but I'm not reopening that issue unless we get a last call comment
to that effect. Assuming we *get* to last call before our charter
expires, of course :-)

-- 
Norman Walsh <ndw@nwalsh.com> | Nothing is worth more than this day.--
http://nwalsh.com/            | Goethe