Do you know any mechanism to extract .owl file from a RDF data set?

Can you be a little more specific?

there are several .rdf data sets. need to find their schema file
(.owl). (.owl files are necessary for ontology alignment.)
Do you know any tool which is to extract .owl file from RDF data set?

No, I don't. Aren't both just XML files? If so, any XML tool could help you.

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