Format:
   ws.cgi?action&parameter=value[&paramater=value ...][&option=value]

   e.g. ws.cgi?get&id=8fab_1&scheme=0  # Get PDB for antibody 8fab_1      
        ws.cgi?list&pdb=8fab           # List antibodies in PDB file 8fab
        ws.cgi?group&id=8fab_1         # List antibodies redundant with 8fab_1
        ws.cgi?chains&id=8fab_1        # List chains for antibody 8fab_1

   Add &json=1 to any of the calls (except 'get') to obtain JSON output

Actions:
   get     - Get a PDB entry
             Requires: id, scheme
   group   - Get members of a redundant group 
             Requires: id
             Options:  complex, dataset
   list    - List IDs of antibodies from a given PDB code
             Requires: pdb
             Options:  complex, dataset
   comfree - Show IDs for antibodies available both complexed and free
             Requires: id
             Options: dataset
   chains  - Show the light, heavy and antigen chains for a given antibody
             Requires: id

Parameters:
   id      - Antibody ID of the form XXXX_Y where XXXX is the PDB code and
             Y is the antibody number
   scheme  - Numbering scheme:
             0|kabat    = Kabat scheme
             1|chothia  = Chothia scheme
             2|martin   = Martin scheme
   pdb     - PDB code of the form XXXX
   complex - 0|all      = All structures, complexed or not [default]
             1|free     = Free antibody
             2|protein  = Complex with protein
             3|np       = Complex with non-protein
   dataset - 0|all      = All structures [default]
             1|lh       = Complete antibodies (L and H chains)
             2|l        = Light chain only (Bence-Jones)
             3|h        = Heavy chain only (Camelid)

Options:
   json    - 1          = Return results in JSON format ('get' not affected)