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The SingleOfSingle relation. The SingleOfSingle relation - PartOf - is the prototypical relation which is the basic model of all partonomic relations. It defines what is a part of some entity in the domain of anatomy.The SingleOfSingle relation specifies a part of a father entity as a child entity sharing some matter with its father entity, when simultaneously there is some matter of the father entity which is not matter of the child entity. This definition based on the matter constituting anatomical entities (biological cells and related material) excludes relations of containment of an entity in another entity, because there is here no sharing of matter.However, the SingleOfSingle relation, for the needs of the TAH, should be extended in order to cope either with immaterial entities or with dendronomic hierarchies. In the situation of immaterial entities, the matter in the above definition is the matter which is either bounded by the immaterial entity or the matter which could fill the immaterial spaces. In the situation of dendronomy, as for vessels, the SingleOfSingle relation becomes the SingleBrSingle relation, documented elsewhere.Example: [ligamentum ceratocricoideum] -> (SingleOfSingle) -> [articulatio cricothyroidea].Name: SingleOfSingle, PartOfAcronym: SOSConceptual schema: [Child entity A] -> (SingleOfSingle) -> [Father entity B]Child entity A: material singular unpairedFather entity B: material singular unpaired
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