Functions of information an retrieval system:
Identify information (sources) relevant to the interests of targeted user community
Analyze the content of information sources (documents)
Represent the contents of analyzed sources in a way that matches users’ queries. Currently, this is done by automatically creating one or more index files
Analyze users’ queries and represent them in a form that will be suitable for matching databases. Currently, this is made in a number of ways, through the design of sophisticated search interfaces including those that can provide some help to users for selection of appropriate search terms, by using dictionary and thesauri, automatic spell checkers, a predefined set of search statements, and so forth
Match search statement(s) with information (documents) in databases. Information retrieval models (will be discussed later) are usually adopted by IRS developers to enable their IRS do the matching between search statements (user queries) and document terms (metadata, descriptors, subject headings, etc.,)
Retrieve information (documents). At the end, IRS should retrieve relevant documents that satisfy user needs. Different tools & techniques are used by IRS to determine relevancy
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