dfxml:used 

This file's metadata structure has at least one attribute
populated.

Element Information

Model

Used By

Complex Type dfxml:fileobject_type

Source 

<xs:element name="used" type="dfxml:bool01">
  <xs:annotation>
    <xs:documentation>This file's metadata structure has at least one attribute populated.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample