Solution sought to the Xalan-key bug

Greetings,

I am new to Schematron and I'm trying to get a definitive solution to
the famous "Markup Error:  no match attribute on <key> outside <rule>".

My understanding so far is that this arises from a bug in Xalan (which I
am compelled to use) which does not allow an attribute called "key".
Having read through the archives of the mailing list and the comments in
skeleton1-5.xsl, I found the following advice:

"Xalan for C 1.0 has problem with key, so edit by hand. Find "KEY"
below"

... we search to line 	

<!-- NOTE: if you get complaint about "key" here (e.g. Xalan4C 1.0)
replace
		"key" with "$hiddenKey" -->
        <xsl:template  match="sch:key | key " mode="do-keys" >

... so I tried;

match="sch:key | $hiddenKey "
match="sch:$hiddenKey | $hiddenKey "
match="sch:$hiddenKey"
match="$hiddenKey"

but all of these produce a TransformerException.

Am I missing something very obvious here? What exactly am I supposed to
change to get it to work? 

Rgds,
Owen Boyle

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