xsl:yes-or-no 

One of the values "yes" or "no".

Simple Type Information

Used By

Attributes xsl:copy-of/@copy-namespaces, xsl:copy/@copy-namespaces, xsl:copy/@inherit-namespaces, xsl:element/@inherit-namespaces, xsl:function/@override, xsl:literal-result-element-attributes/@xsl:inherit-namespaces, xsl:output/@byte-order-mark, xsl:output/@escape-uri-attributes, xsl:output/@include-content-type, xsl:output/@indent, xsl:output/@omit-xml-declaration, xsl:output/@undeclare-prefixes, xsl:param/@required, xsl:param/@tunnel, xsl:sequence-constructor-group/@copy-namespaces, xsl:sequence-constructor-group/@disable-output-escaping, xsl:sequence-constructor-group/@inherit-namespaces, xsl:sequence-constructor-group/@required, xsl:sequence-constructor-group/@stable, xsl:sequence-constructor-group/@tunnel, xsl:sort/@stable, xsl:text/@disable-output-escaping, xsl:value-of/@disable-output-escaping, xsl:with-param/@tunnel

Source 

<xs:simpleType name="yes-or-no">
  <xs:annotation>
    <xs:documentation>One of the values "yes" or "no".</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:token">
    <xs:enumeration value="yes"/>
    <xs:enumeration value="no"/>
  </xs:restriction>
</xs:simpleType>