Description: Standard category codes used in the variable, like industry codes, employment codes, or social class codes. The attribute "date" is provided to indicate the version of the code in place at the time of the study. The attribute "URI" is provided to indicate a URN or URL that can be used to obtain an electronic list of the category codes.
Example(s):
<var><stdCatgry date="1981" source="producer">U. S. Census of Population and Housing, Classified
Index of Industries and Occupations </stdCatgry></var>