Fig. 4

Instance-based semantic graph of a measurement value of a particular quality of an anatomical entity. An instance-based semantic graph documenting the volume measurement of a particular head, stored in a named graph instance of the ontology class ‘anatomical structure volume named graph’. The graph relates an instance of ‘head’ of the Hymenoptera Anatomy Ontology with an instance of ‘specific volume’ of PATO together with the measured value in the form of a float input and an instance of ‘milliliter’ of the Units Ontology specifying the measurement unit. For reasons of clarity, resources are not represented with their URIs but with labels (Additional file 4 documents the SPARQL Query for this named graph together with its result). purple-bordered box = ontology individual; purple-bordered grey box = named graph instance; yellow-bordered box with rounded corners = ontology class; arrow = property