[wwPDB] Enhanced Collection of Starting Models

A new PDBx/mmCIF category, _pdbx_initial_refinement_model has been introduced to improve information collected about starting model for X-ray, 3DEM and NMR methods.

Experimentally derived vs computed models will be distinguished. Provenances of the resources where the starting model was obtained (e.g., PDB, AlphaFoldDB, RoseTTAFold, etc.) and its accession code/identifier will be captured, if publicly available.

For the full definition, see pdbx_initial_refinement_model. An example is below:

 _pdbx_initial_refinement_model.id 1
 _pdbx_initial_refinement_model.entity_id_list 1
 _pdbx_initial_refinement_model.type 'experimental model'
 _pdbx_initial_refinement_model.source_name PDB
 _pdbx_initial_refinement_model.accession_code 3LTQ      

wwPDB strongly recommends all PDB users and software developers to review their code and adopt this definition for future applications.

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