Default values for options

Consider:

<p:declare-step type="foo:bar">
  <p:input ...>
  <p:output ...>
  <p:option name="fribble"/>
</p:declare-step>

...

<foo:bar/>

What is the value of the fribble option seen by the foo:bar step? Is it the
empty string or is this an error (or is there some other choice)?

My inclination is to say that it's the empty string.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | A man may destroy everything within
http://nwalsh.com/            | himself, love and hate and belief, and
                              | even doubt, but as long as he clings to
                              | life he cannot destroy fear.--Joseph
                              | Conrad