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In some IR applications, it is desirable to adopt a high precision search strategy to return a small set of documents that are highly focused and relevant to the user's information need. With these applications in mind, we investigate semantic search using the XML Fragments query language on text corpora automatically pre-processed to encode semantic information useful for retrieval. We identify three XML Fragment operations that can be applied to a query to conceptualize, restrict, or relatedoi:10.1145/1148170.1148247 dblp:conf/sigir/Chu-CarrollPCFD06 fatcat:zpx2bslf5rbofeiaunc5upt5sy