Fig. 1

Representation of edta_plasma, buffy_edta, nacit_plasma, buffy_nacit, plasma, and buffy specimens according to the OBIB strategy. Blue boxes represent classes; red boxes represent individuals; red arrows represent rdfs:subClassOf; green arrows represent rdf:type; blue arrows represent OWL object properties (the labels are specified). While all OWL object properties link instance to instance, in this figure there are object properties connecting OWL classes to each other. This represents a property restriction on the source class with existential quantification (all-some restriction)