[xsl] keys and collections

["Birnbaum, David J" <djbpitt@xxxxxxxx>]

Dear XSLT List,

Is it possible to use a key with a collection, along the lines of:

<xsl:variable name="allInput"
select="collection('file:///path/?select=*.xml')/text/*"/>
<xsl:key name="linebyfolio" match="line" use="@folio"/>

And then, later:

key('linebyfolio',$folio,$allInput)

Using <oXygen/> 13.2 (configured to use Saxon-PE 9.3.0.5), this generates an
error to the effect that: "A sequence of more than one item is not allowed as
the third argument of key() (<title/>, <line/>, ...)." The children of the
<text> elements in the collection are, indeed, <title> and <line> elements.
Removing the "/text/*" from the path doesn't help; the error is then: "A
sequence of more than one item is not allowed as the third argument of key()
(document-node(), document-node(), ...)." I think I understand why this might
be an error, but I seem to have a blind spot in figuring out how to work
around it.

Thanks,

David
djbpitt@xxxxxxxxx