Re: key() in match pattern of xsl:key

On 10 Dec, Michael Kay wrote:
>> Should it be possible to reference one key in the match pattern of 
>> another?  
> 
> Yes, there's no ban on it, in either XSLT 1.0 or 2.0. But I haven't seen it
> done very often.

I disagree, with respect to XSLT 1.0. The recommendation is silent
about this, right, but E13 out of the XSLT 1.0 errata (see
http://www.w3.org/1999/11/REC-xslt-19991116-errata/) cleary states:

    It is an error for the value of either the use attribute or the
    match attribute to contain a VariableReference, or a call to the
    key function.

rolf