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Category Groups in Dictionary mmcif_ddl.dic

category_group: Categories that describe the characteristics of categories.
compliance_group: Categories that are retained specifically for compliance with older versions of the DDL.
datablock_group: Categories that describe the characteristics of data blocks.
ddl_group: Component categories of the macromolecular DDL
dictionary_group: Categories that describe the dictionary.
extension_group: Categories that contain extensions used by the NDB and wwPDB.
item_group: Categories that describe the characteristics of data items.
sub_category_group: Categories that describe the characteristics of subcategories.