Document retrieval and text retrieval
نویسنده
چکیده
DR systems illustrate every variety of indexing language, request and document description, and search mechanism. Controlled languages (CLs) have been commonly used, across the range from only slightly restricted natural language (NL) to a carefully designed artificial language. With CLs professional indexing is required and professional searching is the norm. However automatic DR systems have also encouraged the use of NL through searching on titles and abstracts. This naturally makes end-user searching practicable, though not necessarily easy; and end-users often lack the experience to search effectively when strict word matching fails to identify appropriate documents. The essential requirement in retrieval is that a match between request and document descriptions should reflect the underlying relation between user need and document content.
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