<xsl:apply-templates>

The <xsl:apply-templates> element selects a set of nodes in the input tree and instructs the processor to apply the proper templates to them.

xml

<xsl:apply-templates select=EXPRESSION mode=NAME>
  <xsl:with-param> [optional]
  <xsl:sort> [optional]
</xsl:apply-templates>

None.

select: Uses an XPath expression that specifies the nodes to be processed. An asterisk(*) selects the entire node-set. If this attribute is not set, all child nodes of the current node are selected.
mode: If there are multiple ways of processing defined for the same node, distinguishes among them.

Instruction, appears within a template.

XSLT section 5.4.

Supported.