The RCSB PDB offers links to software tools and descriptive resources for file formats used to describe PDB data. A few of these links include:
mmCIF Resources deposit.pdb.org/mmcif/
Background information, Data Dictionaries (including the PDB Exchange Dictionary), Proposed Data Items for Structural Genomics Depositions, mmCIF-PDB correspondences, OMG CORBA API, and software tools
Chemical Component Dictionary and Description
The PDB Chemical Component Dictionary (formerly the HET Group Dictionary) is available in PDB and mmCIF formats. A guide to these dictionaries is available at deposit.pdb.org/cc_dict_tut.html
PDB File Format Contents Guide Version 2.2
A description of the PDB file format is available.
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