scheme 

identifies the classification scheme within which the set of categories
concerned is defined, for example by a taxonomy element, or by some other
resource.

Attribute Information

Used By

Element tei:catRef

Source 

<xs:attribute name="scheme" type="xs:anyURI">
  <xs:annotation>
    <xs:documentation>identifies the classification scheme within which the set of categories concerned is defined, for example by a taxonomy element, or by some other resource.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample