Re: [wsbpel-spec-edit] follow-up editing for Issue 13

By making "case" an extension and thendefining a
"condition" element in the contentModel, doesn't
this imply that cases are written, by virtue of section 4.2of the XSD
Schema Primer (content models are added
sequentially: base + extension) as:
<case>
    <activity>
    <condition>
</case>

instead of:

<case>
     <condition>
     <activity>
</case>