XSL with extensions is fine, but don’t reinvent the language

IBM pitched a new collection of articles in their Developer Works site today. I took a look at the one on XSLT extensions. The article proposed writing a look-up function to avoid writing a costly-to-evaluate template using nested xsl:for-each. But XSLT has a way around the problem using xsl:key and the key() function in Xpath.

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