xsl:yes-or-no-or-omit 

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

Simple Type Information

Used By

Attribute xsl:output/@standalone

Source 

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