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Identification scheme
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<p>In <a href="/facts/Metadata/qt35z79C">metadata</a>, an identification scheme is used to identify unique records in a <a href="/facts/Set_(mathematics)/BfucfHMq">set</a>. If a <a href="/facts/Data_element/jtyoAIAd">data element</a> is used to identify a record within a <a href="/facts/Data_set/eDvegUTK">data set</a>, the data element uses the <a href="/facts/Identifier_(metadata)/pPaQPLhj">Identifier</a> <a href="/facts/Representation_term/clVjSMY5">representation term</a>. An identification scheme should be contrasted with a <a href="/facts/Classification_scheme/8bSCGSmX">classification scheme</a>. Classification schemes are used to classify individual records into categories. Many records in a data set may be in a single category. </p>