<rdfs:Class rdf:ID="Attribute">
<rdfs:label xml:lang="en">Attribute</rdfs:label>
<rdfs:comment>A measurable physical or abstract property of an entity </rdfs:comment>
<rdfs:subClassOf rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
</rdfs:Class>
<rdfs:Class rdf:ID="Metric">
<rdfs:label xml:lang="en">Metric</rdfs:label>
<rdfs:comment>The defined measurement or calculation method and the measurement scale.</rdfs:comment>
<rdfs:subClassOf rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
</rdfs:Class>
<rdfs:Class rdf:ID="DirectMetric">
<rdfs:label xml:lang="en">DirectMetric</rdfs:label>
<rdfs:comment>A metric of an attribute that does not depend upon other attribute.</rdfs:comment>
<rdfs:subClassOf rdf:resource="#Metric"/>
</rdfs:Class>