The standards present a generalized structure for records, but do not specify the content of the record and do not, in general, assign meaning to tags, indicators, or data element identifiers.
The codes and conventions established explicitly by MARC 21 to identify and further characterize the data elements within a record and to support the manipulation of that data.
A display constant is a term, phrase, and/or spacing or punctuation convention that may be system generated under prescribed circumstances to make a visual presentation of data in a record more meaningful to a user.
Documentstructureconvention, or DSC, is a set of standards for PostScript comments which provide additional information and structure to a PostScript document.
DSC comments begin with two percent signs, and consist of a keyword followed by an optional colon, space character and series of arguments.
DSC version 3.0 was released on September 25, 1992.
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