xsl:expression 

An XPath 2.0 expression.

Simple Type Information

Used By

Attributes xsl:analyze-string/@select, xsl:apply-templates/@select, xsl:attribute/@select, xsl:comment/@select, xsl:copy-of/@select, xsl:for-each-group/@group-adjacent, xsl:for-each-group/@group-by, xsl:for-each-group/@select, xsl:for-each/@select, xsl:generic-element-type/@use-when, xsl:if/@test, xsl:key/@use, xsl:literal-result-element-attributes/@xsl:use-when, xsl:message/@select, xsl:namespace/@select, xsl:number/@select, xsl:number/@value, xsl:param/@select, xsl:perform-sort/@select, xsl:processing-instruction/@select, xsl:sequence-constructor-group/@select, xsl:sequence-constructor-group/@test, xsl:sequence-constructor-group/@use, xsl:sequence/@select, xsl:sort/@select, xsl:value-of/@select, xsl:variable/@select, xsl:when/@test, xsl:with-param/@select
Simple Type xsl:pattern

Source 

<xs:simpleType name="expression">
  <xs:annotation>
    <xs:documentation>An XPath 2.0 expression.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:token">
    <xs:pattern value=".+"/>
  </xs:restriction>
</xs:simpleType>