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The OLAP DML provides the following special data objects that you use not when you are defining your variables, but instead, when you are querying them,
Valueset Objects
A valueset is a list of dimension values for one or more previously-defined dimensions. You use a valueset to save dimension status lists across sessions.
Surrogates
A dimension surrogate is an alternative set of values for a previously-defined dimension. You cannot dimension a variable by a surrogate, but you can use a surrogate rather than a dimension in a model, in a LIMIT command, in a qualified data reference, or in data loading with statements such as FILEREAD, FILEVIEW, SQL FETCH, and SQL IMPORT.