data.xTruthValue

data.xTruthValue (extended truth value) defines the range of attribute values used to express a truth value which may be unknown.
Module tei — 1 The TEI Infrastructure
Used by
Class:
Element:
Declaration 

<rng:define name="data.xTruthValue">
 <rng:choice>
  <rng:data type="boolean"/>
  <rng:value>unknown</rng:value>
  <rng:value>inapplicable</rng:value>
 </rng:choice>
</rng:define>
data.xTruthValue = xsd:boolean | "unknown" | "inapplicable"
Note
In cases where where uncertainty is inappropriate, use the datatype data.TruthValue.