Standard: http://www.w3.org/TR/xslt#element-call-template

call-template

Attributes: name

Standard excerpt:

Templates can be invoked by name. An xsl:template element with a name attribute specifies a named template. If an xsl:template element has a name attribute, it may, but need not, also have a match attribute. An xsl:call-template element invokes a template by name; it has a required name attribute that identifies the template to be invoked. Unlike xsl:apply-templates, xsl:call-template does not change the current node or the current node list.