]> Individuals of type Term represent ontological concepts, which can be defined in OBO flat format files, as described in the document at www.geneontology.org/GO.format.shtml. During conversion from a heirarchical, class-based representation, each OBO Term in the heirarchy is represented as an individual of type Term and related to the other Term individuals by the properties superProperty (for its superclasses), subProperty (for its immediate subclasses), and rootProperty (to identify which, if any, namespace the term is located in). Converted Term individuals are stored one per URI (in the simple case, they can be stored in files). For example, in the converted GO ontology, the GO Id (e.g. GO:0006260 for the GO Term "dna replication") uniquely identifies the term, so the GO Id is the obvious choice for the last part of the URI (e.g. file name) of the GOElement. Since the colon character is reserved in URI space for port designations, we follow the convention of the consortium's prototype OBO to OWL converter and replace the colon with an underscore. So, assuming that ontologies.ncgr.org/GeneOntology/ is the root URI from which this class definition was retrieved, the GOElement individual for GO:0006260 would be retrieved from ontologies.ncgr.org/GeneOntology/BiologicalProcess/GO_0006260 All Term individuals must have the properties (from fields in the OBO file) and associated minimum..maximum cardinalities specified by the the subclass restrictions below. Note that the cardinalities of subProperty and subProperty are unrestricted, since not all GO Ids have is_a relationships, so there are no property restrictions for these two properties. 1 1 1 1 1 1 1 1