Passing document href as an option in XProc - xslt

Question

I have an XProc script that currently hardcodes document hrefs like this:
<p:xslt>
<p:input port="source"/>
<p:input port="stylesheet">
<p:document href="/path/to/stylesheet.xsl"/>
</p:input>
</p:xslt>
I would like to pass /path/to/stylesheet.xsl as an option to the xproc script, so in my declare-step I put:
<p:option name="stylePath" required="true"/>
but I still can't figure out how to replace the hardcoded href in p:document with the option value.
I'll be most grateful for your help.

Answer 1

Here's what eventually worked for me:
Create a step to load the document with the option passed to it:
<p:load name="getStylesheetSource">
<p:with-option name="href" select="$stylePath" />
</p:load>
Then, in the XSLT step, pipe the loaded stylesheet
<p:xslt name="transform">
<p:input port="source">
<!-- etc. -->
</p:input>
<p:input port="stylesheet">
<p:pipe step="getStylesheetSource" port="result" />
</p:input>
</p:xslt>
With this setup, one can pass the stylePath option when invoking the XProc script without having to hard code the path.