<langUsage>

<langUsage> (language usage) describes the languages, sublanguages, registers, dialects, etc. represented within a text. 2.4.2 Language Usage 2.4 The Profile Description 15.3.2 Declarable Elements
Module header — 2 The TEI Header
In addition to global attributes att.declarable (@default)
Used by
model.profileDescPart
May contain
header: language
Declaration 

<rng:element name="langUsage">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.declarable.attributes"/>
 <rng:oneOrMore>
  <rng:choice>
   <rng:ref name="language"/>
  </rng:choice>
 </rng:oneOrMore>
</rng:element>
element langUsage
{
   att.global.attributes,
   att.declarable.attributes,
   language+
}
Example
<langUsage>
 <language ident="fr-CA" usage="60">Québecois</language>
 <language ident="en-CA" usage="20">Canadian business English</language>
 <language ident="en-GB" usage="20">British English</language>
</langUsage>