Fig. 4
From: Using a units ontology to annotate pre-existing metadata
Conceptual RDF “triples” that could be added to metadata for a measurement of “phosphate concentration in soil pore water” as an annotation. (a) Triple specifying that it uses the unit “MicroMOL-PER-L” from the QUDT ontology. (b) three additional triples showing what was measured (phosphate), its matrix and context (terrestrial biome and interstitial water, respectively). The QUDT ontology provides for an additional inferred annotation: through its unit, the measurement is associated with the quantity kind “concentration”. Terms derived from different ontologies are shown in different colors.
