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As explained in "4.8 Indexing External Documents"
You can use semantic indexing on (external) documents that are stored in a file system or on the network. To create a policy for this, the type attribute of the <Datastore> element (in the preferences parameter) should be accordingly set to "FILE" or "URL".
The equivalent of USER_DATASORE for a text index on a semantic index can be viewed as a method extractRDF user-defined mdsys.rdfctx_extractor.