Matching language attributes can also be accomplished via a lang() function.

Example:

<terms>
<term xml:lang="en"></term>
<term xml:lang="fr"></term>
<term xml:lang="pl"></term>
</terms>

to find the Polish language term:

<xsl:template match="term[lang('pl')]">
Polish: <xsl:apply-templates/>
</xsl:template>