scheme 

identifies the foliation scheme in terms of which the location is
being specified by pointing to some foliation element defining it, or to some other
equivalent resource.

Attribute Information

Source 

<xs:attribute name="scheme" type="xs:anyURI">
  <xs:annotation>
    <xs:documentation>identifies the foliation scheme in terms of which the location is being specified by pointing to some foliation element defining it, or to some other equivalent resource.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample