Data type: char
Must appear in a looped list containing '_citation_id'
no 'citation unrelated to current coordinates'
n 'abbreviation for "no"'
yes 'citation related to current coordinates'
y 'abbreviation for "yes"'
_citation_coordinate_linkage states whether or not this citation is concerned with precisely the set of coordinates given in the data block. If, for instance, the publication described the same structure, but the coordinates had undergone further refinement prior to creation of the data block, the value of this data item would be 'no'.