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5.10 Vgroup Backward Compatibility Issues
5.10.1 Vset Implementation Integrated into the Vgroup Interface
In HDF versions before 2.0, vsets were created and manipulated through an interface separate from the other HDF interfaces. A pointer to a specially-defined vset structure was returned by the Vset interface and data type definitions specific to the Vset interface were used. The names of these definitions were prefaced by "LOCAL_".
After HDF version 2.0, the vgroup_id identifier replaced the pointer to the vset structure, the "LOCAL_" data type definitions were made obsolete by newer definitions, and all vset functionality was integrated into the Vgroup interface routines. HDF programs written for HDF libraries earlier than version 2.0 should be modified accordingly in order to function correctly with newer versions of HDF.
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HDF User's Guide - 05/19/99, NCSA HDF
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