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Modeling

The CF standard names are basically captured as SKOS Concept instances. This is done via a :Standard_Name subclass of skos:Concept, and constructing a instance of :Standard_Name for each entry in the original XML file.

For example, the following entry:

   <entry id="sea_surface_temperature">
      <canonical_units>K</canonical_units>
      <description>Sea surface temperature is usually abbreviated as &quot;SST&quot;. It is the temperature of sea water near the surface (including the part under sea-ice, if any), and not the skin temperature, whose standard name is surface_temperature. For the temperature of sea water at a particular depth or layer, a data variable of sea_water_temperature with a vertical coordinate axis should be used.</description>
   </entry>

is converted to the following RDF representation:

@prefix :        <http://mmisw.org/ont/cf/parameter/> .
@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .
@prefix owl:     <http://www.w3.org/2002/07/owl#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix skos:    <http://www.w3.org/2004/02/skos/core#> .

:Standard_Name
      a       owl:Class ;
      rdfs:label "Standard Name" ;
      rdfs:subClassOf skos:Concept .

:canonical_units
      a       owl:DatatypeProperty ;
      rdfs:domain :Standard_Name ;
      rdfs:range xsd:string .

:sea_surface_temperature
      a       :Standard_Name ;
      :canonical_units "K" ;
      skos:definition "Sea surface temperature is usually abbreviated as \"SST\". It is the temperature of sea water near the surface (including the part under sea-ice, if any), and not the skin temperature, whose standard name is surface_temperature. For the temperature of sea water at a particular depth or layer, a data variable of sea_water_temperature with a vertical coordinate axis should be used." .