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To the best of our knowledge, guidelines for the conceptualization and representation of domain-specific concepts prone to be described based on multiple (potentially alternative) classification criteria, has not been explicitly considered in the context of ontology modeling for the Semantic Web. General examples of domain-specific concepts that exhibit the characteristics described abound, going from a "bibliographic reference", (which could be classified according to several criteria such as "subject", "author", "publication venue", etc.); to a "toy" (which could be classified based on "suitable age", "brand", "subject type", etc.). The list of examples can go on. We have seen in our own experience that lack of specific design guidelines leaves ample room for conceptual errors when trying to develop a simple domain-specific ontology model for such concepts. For example, common mistakes when trying to represent these concepts and their classification criteria are to use subsumption relations between classes when in fact a part-of relation would be in order, or to use subsumption to model relationships that are outside OWL DL expressivity altogether. Other examples of domain-specific concepts that can fit into the modeling scenario described are particularly interesting because they are used in well-known ontology development literature using OWL. They include: "Wine" [[Community:References/OWL web ontology language guide|(Welty et al., 2004)]], "Person" (in the context of family history relations) [[Community:References/OWL 2 web ontology language primer|(Krotzsch et al., 2009)]], or "Pizza" [[Community:References/A Practical Guide To Building OWL Ontologies Using Protege 4 and CO-ODE Tools Edition 1 2 2|(Horridge et al., 2009)]]. However, in none of them, they refer explicitly to the various classification criteria of the domain concept that are considered implicitly, nor attempt to represent these criteria explicitly in the respective ontology models developed. This modeling issue refers to the conceptualization of a specific domain concept using a Faceted Classification Scheme (FCS). A FCS is defined as: "a set of mutually exclusive and jointly exhaustive categories, each made by isolating one perspective on the items (a facet), that combine to completely describe all the objects in question, and which users can use, by searching and browsing, to find what they need" [[Community:References/How to Make a Faceted Classification and Put It On the Web 2|(Denton, 2003)]]. The section '''Diagram''' below presents an example of a FCS in the domain of "Dishwashing Detergent" from [[Community:References/How to Make a Faceted Classification and Put It On the Web 2|(Denton, 2003)]]. A more detailed explanation of this modeling issue and the rationale of one proposed solution is presented in the paper: [[Community:References/How to Reuse a Faceted Classification and Put it on the Semantic Web|(Rodriguez-Castro et al., 2010)]]. The OWL file in section '''Proposed Solutions''' provides an OWL DL implementation of the example FCS in section '''Diagram''' applying the [[Submissions:Normalization|Normalization]] ODP as outlined in the paper mentioned.
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