the fast-growing literature in every field of knowledge. En los años 1960, an online bibliographic database industry developed based on dialup X.25 networking. These services were seldom made available to the public because they were difficult to use; specialist librarians called search intermediaries handled the searching job. en la década de 1980, the first full text databases appeared; these databases contain the full text of the index articles as well as the bibliographic information. Online bibliographic databases have migrated to the Internet and are now publicly available; sin embargo, most are proprietary and can be expensive to use. Students enrolled in colleges and universities may be able to access some of these services without charge; some of these services may be accessible without charge at a public library. In large organizations, controlled vocabularies may be introduced to improve technical communication. The use of controlled vocabulary ensures that everyone is using the same word to mean the same thing. This consistency of terms is one of the most important concepts in technical writing and knowledge management, where effort is expended to use the same word throughout a document or organization instead of slightly different ones to refer to the same thing. Web searching could be dramatically improved by the development of a controlled vocabulary for describing Web pages; the use of such a vocabulary could culminate in a Semantic Web, in which the content of Web pages is described using a machine-readable metadata scheme. One of the first proposals for such a scheme is the Dublin Core Initiative. It is unlikely that a single metadata scheme will ever succeed in describing the content of the entire Web. To create a Semantic Web, it may be necessary to draw from two or more metadata systems to describe a Web page's contents. The eXchangeable Faceted Metadata Language (XFML) is designed to enable controlled vocabulary creators to publish and share metadata systems. XFML is designed on faceted classification principles. Controlled vocabularies of interest to psychologists Gene Ontology, Foundational Model of Anatomy (FMA), Thesaurus of Psychological Index Terms Neurolex Neuronames, Ontology of Biomedical Investigation (OBI) Phenotype and Trait Ontology (PATO), Unified Medical Language System (UMLS), the See also Authority control Collabulary Faceted classification Full text search Information retrieval Metadata Metadata registry Ontology Semantic spectrum Subject heading Text retrieval Thesaurus XFML References ^ Amy Warner, A taxonomy primer. ^ Karl Fast, Fred Leise and Mike Steckel, What is a controlled vocabulary? ^ Cory Doctorow, Metacrap. ^ Mark Pilgrim, This is XFML. Controlled Vocabularies Links to examples of thesauri and classification schemes. External links Controlled vocabularies: a glosso-thesaurus ControlledVocabulary.com explains how controlled vocabularies are useful in describing images and information for classifying content in electronic databases. EServer TC Library: Controlled Vocabulary
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