Ubiseditor 3.0: Collaborative Ontology Development On The Web
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Transaction management One important task is the implementation of a transaction management to avoid problems when multiple users edit the ontologies and commit their changes simul- taneously. However, since our system stores the different ontologies in a database back end, the concurrency control will probably be solved on the database level. In addition, we think about implementing a locking mechanism on the subtree or ontology module level to avoid inconsistencies. Conflicts When different members of a community collectively extend an ontology, different opinions inevitably can cause conflicts to occur. Consequently, a conflicts resolution is an essential functionality. We plan to solve this problem using a combined approach consisting of a community-based and a role-based conflicts resolution strategy similar to the one proposed by Li et al. in [4]. Duplication of concepts In order to avoid dublicated concepts, we already implemented a search engine for the UbisWorld system, which can be used to find classes, instances and properties of the UbisOntology. This is a very important feature with regard to the editing process using UbisEditor. When a user plans to insert a new element into the UbisWorld ontology, but is not sure whether an appropriate concept already exists, the UbisSearch can be used to remove ambiguity.
Transaction management One important task is the implementation of a transaction management to avoid problems when multiple users edit the ontologies and commit their changes simul- taneously. However, since our system stores the different ontologies in a database back end, the concurrency control will probably be solved on the database level. In addition, we think about implementing a locking mechanism on the subtree or ontology module level to avoid inconsistencies.
Conflicts When different members of a community collectively extend an ontology, different opinions inevitably can cause conflicts to occur. Consequently, a conflicts resolution is an essential functionality. We plan to solve this problem using a combined approach consisting of a community-based and a role-based conflicts resolution strategy similar to the one proposed by Li et al. in [4].
Duplication of concepts In order to avoid dublicated concepts, we already implemented a search engine for the UbisWorld system, which can be used to find classes, instances and properties of the UbisOntology. This is a very important feature with regard to the editing process using UbisEditor. When a user plans to insert a new element into the UbisWorld ontology, but is not sure whether an appropriate concept already exists, the UbisSearch can be used to remove ambiguity.
Ontology segmentation or the creation of ontology views is an important issue. Since many ontologies constantly grow in size and are therefore more and more difficult to understand, maintain and edit, ontology segmentation shall help to extract only those parts of a large ontology that are relevant for a certain scenario and to create a stand-alone ontology out of these concepts. Seidenberg and Rector com- pare and evaluate several algorithms for extracting relevant segments in [9]. The key approach is to let the user select some relevant concepts and to automatically add super- classes, subclasses and other related concepts (e.g. classes contained in axioms and restrictions) to the ontology view.