There are some things in XPath that I really like. For example `x = ( a, b, c )' means: `(x == a or x == b or x == c)' which is quite handy sometimes. Also `(a,default)[1]' makes it easy to provide a default if a is null.
data: <data attr="1" />
xsl:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs" version="2.0">
<xsl:template match="/data">
<one>
<xsl:value-of select="@attr = (2,3,4)" />
</one>
<two>
<xsl:value-of select="(@doesntexist,2)[1]" />
</two>
</xsl:template>
</xsl:stylesheet>