data.certainty

data.certainty defines the range of attribute values expressing a degree of certainty.
組件tei — 1 The TEI Infrastructure
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<rng:define name="data.certainty">
 <rng:choice>
  <rng:value>high</rng:value>
  <rng:value>medium</rng:value>
  <rng:value>low</rng:value>
  <rng:value>unknown</rng:value>
 </rng:choice>
</rng:define>
data.certainty = "high" | "medium" | "low" | "unknown"