Allow p:inline etc. for p:option

[xml-project]

The current syntax does not allow something like

<p:option name="opt-with-doc" as="document-node()" select=".">
 <p:inline>
   <div att="5" />
 </p:inline>
</p:option>

The only way to assign a document as default value for an option is odd:

<p:option name="Rendering-XHTML" as="document-node()"
  select="parse-xml('&lt;div att=&quot;5&quot; /&gt;') "/>

As this is already possible for p:variable and p:with-option, I think allowing a document binding for p:option would also feel natural.