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  1. POhow to extract synonyms from MeSH ontology?
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    1. CO@safé: what do you mean exactly by "class synonyms"? the OWL equivalent classes? Also, it would help if you add to your question a portion of the ontology that you're working with, and an example of what you're trying to extract: this will help in understanding what you're doing, and in suggesting solutions.
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    2. COI don't know exactly how those classes are classified in OWL, But I am sure that they aren't equivalent. For exemple, when using MeSH Browser and adding "cancer" as query, all the information returned are about "neoplasm" because in MeSH "cancer" and "neoplasm" are synonyms [link](http://www.nlm.nih.gov/cgi/mesh/2011/MB_cgi?mode=&index=8969&view=concept ) (see the related concepts). However I don't know how this relation is descriped in OWL and how to extract it using sparql.
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    3. CO@safé: I'm afraid I can't help you. In order to write a SPARQL query you must know the structure of RDF graph you want to query. You can query an OWL ontology, provided that you know how it's organized (and so, how its RDF serialization looks like). I recommend that you find out the structure of the "MeSH" ontology, and then ask again your question. As it is at the moment is like asking "how do I extract information from a database that I don't know how it's made"? ... impossible :)
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