Severe limitation of the xsl:key element with multiple

Hi all,

We use XSLT to process multiple source documents and generate one result
document.
Therefore we decided to exclusively use the document() XPath in front of all
our XPath expressions to address the right source document. Also, all our
source documents are equal "citizens", so we decided to pass an empty "main"
document to Xalan.

But now we need to define XSLT keys in our source documents so we tried to
use the following declaration:
<xsl:key name="key_1" match="document('id:042C5210')/codesTable/entry/value"
use="../code" />

And we discovered that Xalan rejects this because of the presence of the
document() function call.
After checking the spec we discovered that the "match" attribute of the
xsl:key element must be a pattern (http://www.w3.org/TR/xslt#NT-Pattern) and
not an expression (http://www.w3.org/TR/xpath#NT-Expr).

This prevents us from declaring any keys in our case which we find to be a
severe limitation in XSLT 1.0.
So we checked latest XSLT 2.0 working draft and found that the same
constraint.

Are we missing something? 
Is there any other way to define key from multiple source documents?

Many thanks for your help,
Jerome.


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