For the following four items, I can't seem to find an explicit declaration of the item.category_id. For the third one, I cannot make the match even by implicit use of the appropriate save-frame name, since the item name does not match the block name. For the others, there is such a match, and it seems that the DDL2.1.0 rules allow the item.category_id to be derived implicitly, but I would suggest that for clarity and consistency that the item.category_id be given explicitly. _chem_link.type_comp_1 _chem_link.type_comp_2 _phasing_mir_der.set_id <--- defined in _phasing_mir_der.der_set_id _phasing_mir_der_refln.set_id Here are two cases the program found where a block name fails to match any of the item names within it (including the case above) ciftbx warning: cifdic.m95 save__phasing_mir_der.der_set_id line: 17247 No name in the block matches the block name ciftbx warning: cifdic.m95 save__phasing_mir_der.native_set_id line: 17299 No name in the block matches the block name -- Herbert J. Bernstein (yaya@aip.org)