p:choose is poorly and/or incorrectly specified

The description of p:choose says:

  The outputs of the p:choose are taken from the outputs of the
  selected subpipeline. The p:choose has the same number of outputs as
  the selected subpipeline with the same names. If the selected
  subpipeline has a primary output port, the port with the same name
  on the p:choose is also a primary output port.

This is followed later by Example 7 which reads, in part:

<p:choose name="version">
  <p:when test="/*[@version = 2]">
    <p:validate-with-xml-schema>...
  </p:when>

  <p:when test="/*[@version = 1]">
    <p:validate-with-xml-schema>...
  </p:when>

  <p:when test="/*[@version]">
    <p:identity/>
  </p:when>

  <p:otherwise>
    <p:output port="result">
      <!-- this output is necessary so that all the branches have
           the same outputs; it'll never really matter because
           we're just about to raise an error. -->
    ...

The comment in the otherwise suggests that the preceding p:when
statements have an output named result. This is partially supported
by section 2.3:

  Additionally, if a compound step has no declared outputs and the
  last step in its subpipeline has an unbound primary output, then an
  implicit primary output port will be added to the compound step (and
  consequently the last step's primary output will be bound to it).
  This implicit output port has no name. It inherits the sequence
  property of the port bound to it.

Except that 2.3 says the implicit output port has no name.

Bleh.

I'm tempted to change 2.3 to say that the implicit output port is
named "result". Either that, or our example has to be changed so that
every p:when explicitly declares an output named result.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | In a universe of electrons and selfish
http://nwalsh.com/            | genes, blind physical forces and
                              | genetic replication, some people are
                              | going to get hurt, other people are
                              | going to get lucky, and you won't find
                              | any rhyme or reason in it, nor any
                              | justice.--Richard Dawkins