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A given datum's status value is metadata, i.e. a statement about a particular datum, usually in the case where no actual data entry or categorical choice for that datum has been made.
A datum's information privacy constraints can be defined mainly by way of the "data protection item".
A datum status's given states (missing, recorded, etc.) may be accompanied by values that they are represented as in 3rd party databases by using the "has database crossreference" hasDbXref relation, e.g. "hasDbXref 'NCBI Biosample: 'not collected'"
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