What is an SGML Entity and a Public Entity Set?
SGML, ISO/IEC 8879:1986, contains a mechanism to refer to characters, syllables and symbols that are not to be found on normal keyboards or that are difficult to store and transmit unambigously. It is acheived by defining so called (SDATA) Entities, where one has essentially given a name to a character, syllable or symbol and is assuming that a system processing the SGML data will be able to understand the reference, either by its name or the so called replacement text. To refer to an entity in an SGML file the name is prefixed by “&” and followed by “;”. For example α to refer to the greek alpha. ISO has published some number of collections of entities; the Public Entity Sets, and work is in progress to add a large number of entity sets for non-latin languages. For the purposes of reviewing and commenting on the sets the name and comment are the only relevant parts. The pubished entity sets also refer to characters, if present, in ISO 10646 as well as to entries in the Internati
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