We use the term ''model'' to refer to a particular structure that is known to be correct. This structure will then be used as reference in the validation process. A model is identified by its residue annotation (3-letter code). The origin of the models used by '''ValidatorDB''' is the wwPDB Chemical Component Dictionary (wwPDB CCD).
The term ''motif'' is used here as a fragment of a biomacromolecule, biomacromolecular complex or ligand, made up of
one or more residues or parts of residues. Specifically, the term ''input motif'' refers to the individual molecule being validated, together with its surroundings (i.e., atoms from neighboring residues, within two bonds of any atom of the validated molecule). Each ''input motif'' in '''ValidatorDB''' is assigned a unique motif identifier based on its PDB entry of origin. On the other hand, the term ''validated motif'' (or ''validated molecule'') refers strictly to the subset of atoms in the ''input motif'' which were successfully mapped to atoms in the ''model''.