| Metadata elements |
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| l | Tagable Metadata |
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| ¡ | Elements: title,
author, affiliation, etc. |
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| ¡ | Method: directly
identified |
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| l | Non-tagable
Metadata |
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| ¡ | Elements:
subject, coverage, genre etc. |
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| ¡ | Method:
classified into given topics via TC |
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