variants 

The attribute variants defines the list of variants in which this SubClass is valid. When the attribute is absent the SubClass is valid in all variants.

Attribute Information

Used By

Attribute Group attlist.SubClass

Source 

<xs:attribute name="variants" type="xs:IDREFS">
  <xs:annotation>
    <xs:documentation xml:lang="en-US">The attribute variants defines the list of variants in which this SubClass is valid. When the attribute is absent the SubClass is valid in all variants.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample