Sally H. McCallum

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Preface Rights expression languages (RELs) are emerging in the information community that support different aspects of the digital access environment-licensing, payments, web material, use control, access, etc. They go to different depths in the data they specify and they take different approaches vis-à-vis machine manipulation. These variations make it(More)
A thesaurus is a controlled vocabulary arranged in a known order and structured so that equivalence, homographic, hierarchical, and associative relationships among terms are displayed clearly and identified by standardized relationship indicators that are employed reciprocally. The primary purposes of a thesaurus are (a) to facilitate retrieval of documents(More)
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