The Free On-line Dictionary of Computing (30 December 2018):

Uniform Resource Citation

    (URC) A set of attribute/value pairs
   describing an object.  Some of the values may be URIs 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)