A single reference pointer list pertains only to one bibliographic reference, being a list of all the in-text reference pointers to that single reference to be found in the citing work. Note that this semantic constraint is handled by the combined use of a particular restriction of this class, i.e. that the list pertains to exactly one owl:Thing, and that the following SWRL rule applies: c4o:InTextReferencePointerList(?l), c4o:denotes(?p, ?r), swan:item(?l, ?i), swan:itemContent(?i, ?p) -> c4o:pertainsTo(?l, ?r)