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guidance on segments

herbert_bernstein (yaya@aip.org)
Mon, 11 Mar 96 15:22:11 EST 

xplor defines a segment as:
                     "a protein with one continuous
polypeptide chain, a continuous polypeptide chain itself, a substrate,
a cofactor, a ligand, a set of water molecules, or a single nucleic
acid strand. "

In processing PDB entries the segment ID is used in place of the chain
identifier by xplor.  What is the intended approach in mmcif?  Use of
atom_site.auth_asym_id comes to mind, but then raises the question of
what to use for an actual author asym id.  Guidance please.