all 

The attribute all may be used to indicate that all ModifierClasses are valid. In such a case, the element ModifiedBy does not contain an element ValidModifierClass. The default value of the attribute all is true.

Attribute Information

Used By

Attribute Group attlist.ModifiedBy

Source 

<xs:attribute name="all" type="xs:boolean" default="true">
  <xs:annotation>
    <xs:documentation xml:lang="en-US">The attribute all may be used to indicate that all ModifierClasses are valid. In such a case, the element ModifiedBy does not contain an element ValidModifierClass. The default value of the attribute all is true.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample