Standard: http://www.w3.org/TR/xslt#section-Defining-Template-Rules

template

Attributes: match, name, priority, mode

Standard excerpt:

A template rule is specified with the xsl:template element. The match attribute is a Pattern that identifies the source node or nodes to which the rule applies. The match attribute is required unless the xsl:template element has a name attribute ]). It is an error for the value of the match attribute to contain a VariableReference. The content of the xsl:template element is the template that is instantiated when the template rule is applied.
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