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ppropriate new subtypes. Intuitively, however, the role of a concept is a different property than its generic type, so that combining both in one hierarchy may appear awkward; another solution is to separate role and concept and maintain different taxonomies, as does the GALEN approach [Rector]. Problem #2: specialization of CCGs The specialization of concepts specified in the type hierarchy is complemented by CCGs restricting the ranges of the subtype's related concepts. The CCG of such a specialized concept is given by (has_observation) -> [effusion] (has_location) -> [pleural_space]. According to the two roles pleural_effusion can play (see above), two cases must be distinguished: a) specialization of the CCG for rad_finding In this case the problem is the same as #1, although it is questionable why the observation of the radiology finding pleural_effusion should be the (more general) observation effusion (allowing other subtypes of effusion to take the place)
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ppropriate new subtypes. Intuitively, however, the role of a concept is a different property than its generic type, so that combining both in one hierarchy may appear awkward; another solution is to separate role and concept and maintain different taxonomies, as does the GALEN approach [Rector]. Problem #2: specialization of CCGs The specialization of concepts specified in the type hierarchy is complemented by CCGs restricting the ranges of the subtype's related concepts. The CCG of such a specialized concept is given by (has_observation) -> [effusion] (has_location) -> [pleural_space]. According to the two roles pleural_effusion can play (see above), two cases must be distinguished: a) specialization of the CCG for rad_finding In this case the problem is the same as #1, although it is questionable why the observation of the radiology finding pleural_effusion should be the (more general) observation effusion (allowing other subtypes of effusion to take the place)
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