usage 

specifies the approximate percentage (by volume) of the text which
uses this language.

Attribute Information

Used By

Element tei:language

Source 

<xs:attribute name="usage" type="xs:nonNegativeInteger">
  <xs:annotation>
    <xs:documentation>specifies the approximate percentage (by volume) of the text which uses this language.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample