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Texts may be
classified by one or more
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topic-descriptive
keywords: <keyWords>
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(public)
classification codes: <textClass>
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or by (private)
classification or typology:
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<catRef>
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Classification
schemes may be
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explicitly defined in the <classDecl>
element
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implied by
reference in source attribute
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Again,
authority control is not mandatory (but
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recommended!)
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