All things described by RDF are called resources, and are instances of the class rdfs:Resource. In OWL this is represented by owl:Thing.
owl:Thing is the concept that is the top of all resources in the ontology, meaning all resources in a Coins Building Information Model are directly or indirectly derived from owl:Thing.
Formal Representation in RDF/XML
<owl:Class rdf:about="owl:Thing"> <rdfs:label>Thing</rdfs:label> <rdfs:comment>The class of OWL individuals.</rdfs:comment> <rdfs:subClassOf rdf:resource="rdf:Resource"/> <rdfs:isDefinedBy rdf:resource="http://www.w3.org/2002/07/owl#"/> </owl:Class>