Children of _diffrn.id missing

[jamesrhester]

Various categories in imgCIF have names starting with diffrn (e.g. diffrn_scan_axis, diffrn_scan). I believe it is implied that a child data name of _diffrn.id is present in the category in these cases, but such child data names are not always defined by the dictionary. Am I correct in suggesting that these data names should be added to the relevant categories and to the category keys as well? I believe it is correct to say that for most data files these child data names can be left out as they implicitly take the value of _diffrn.id for data blocks containing data from a single wavelength, so there are no implications for existing data files of these data names being added in.