First stab at p:namespaces

With two days of on-site stuff keeping me busy, I didn't make as much progress
as I hoped, but I have rewritten 5.7, especially 5.7.3

  http://www.w3.org/XML/XProc/docs/langspec.html#opt-param-bindings

Comments (you got it totally wrong), suggestions (can't you make it sensible), etc. 
most welcome, as always.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | Those who in their youth did not live
http://nwalsh.com/            | in self-harmony, and who did not gain
                              | the true treasures of life, are later
                              | like long-legged old herons standing
                              | sadly by a lake without fish.--The
                              | Dhammapada