[dsdl-comment] trigger for next section, before, at or....

Given

    <namespace ns="http://www.w3.org/1999/xhtml">
      <validate schema="xhtml.rng">
        <context path="head"
                 useMode="rdf"/>
      </validate>
    </namespace>

does the useMode trigger take effect 'at' the head element,
or before it, i.e. where is the section boundary?

TIA

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk
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