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Re: [xsl] use-when attribute?

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I suppose one obvious approach would be this ...

    <xsl:variable name="citerefs" select="//db:biblioref/@linkend |
                                    //cite:biblioref/@cite:key |
                                    //tei:cit/@href"/>

.... but I'm worried that's a bad idea from a performance standpoint. Any other alternatives?

If performance is your only worry with this expression (you don't seem to worry about 'interference'), you could use the following:

<xsl:key name="citerefs" match="db:biblioref/@linkend" use="'all'" />
<xsl:key name="citerefs" match="cite:biblioref/@cite:key" use="'all'" />
<xsl:key name="citerefs" match="tei:cit/@href" use="'all'" />

And use key('citerefs', 'all') instead of $citerefs..

Cheers,
Geert

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