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The semantic indexing feature is itself a framework. There is no native NLP engine bundled with it.
There are NLP engines like Open Calais, GATE, and Lymba that can work with this framework. Some engines
can take an ontology and map entities (events, individuals, relationships etc.) embedded in the text to definitions in the ontology. You can also perform the mapping yourself. For example, you can take out the rdfs:label (or comment, or some other descriptive parts) of URIs, build an Oracle Text index, perform a fuzzy text match for a given piece of phrase, and select the URI that gives the best matching score.
Hope it helps,