data.xTruthValue

data.xTruthValue  (extended truth value) defines the range of attribute values used to express a truth value which may be unknown.
모듈tei — 1 The TEI Infrastructure
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<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"