Source : Free On-Line Dictionary of Computing

Uniform Resource Citation
     
         (URC) A set of attribute/value pairs
        describing an object.  Some of the values may be {URI}s of
        various kinds.  Others may include, for example, athorship,
        publisher, datatype, date, copyright status and shoe size.  A
        URC is not normally considered as a string, but a set of
        fields and values with some defined free formatting.
     
        (1995-03-24)