This topic describes the directory information model of X.500, which GDS is based on. A directory is a collection of information about some part of the world. The most familiar type of directory is the list of names and numbers that make up a city telephone directory. A name is provided with some information about the named object, such as an address and telephone number. The ISO and CCITT standards define a directory information model that defines the abstract structure of directory information, services, and protocols for a computer network environment, such as DCE.
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