Work in progress

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:j.0="http://qudt.org/schema/qudt/"
    xmlns:owl="http://www.w3.org/2002/07/owl#"
    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="http://qudt.org/vocab/unit/NUM-PER-KiloM2">
    <rdf:type rdf:resource="http://qudt.org/schema/qudt/Unit"/>
    <j.0:conversionMultiplier rdf:datatype="http://www.w3.org/2001/XMLSchema#decimal">0.000001</j.0:conversionMultiplier>
    <j.0:conversionMultiplierSN rdf:datatype="http://www.w3.org/2001/XMLSchema#double">1.0E-6</j.0:conversionMultiplierSN>
    <j.0:hasDimensionVector rdf:resource="http://qudt.org/vocab/dimensionvector/A0E0L-2I0M0H0T0D0"/>
    <j.0:hasQuantityKind rdf:resource="http://qudt.org/vocab/quantitykind/ParticleFluence"/>
    <j.0:symbol>/km²</j.0:symbol>
    <j.0:ucumCode rdf:datatype="http://qudt.org/schema/qudt/UCUMcs">{#}.km-2</j.0:ucumCode>
    <rdfs:isDefinedBy rdf:resource="http://qudt.org/2.1/vocab/unit"/>
    <rdfs:label xml:lang="en">Number per square kilometre</rdfs:label>
  </rdf:Description>
</rdf:RDF>

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

<http://qudt.org/vocab/unit/NUM-PER-KiloM2>
  rdf:type <http://qudt.org/schema/qudt/Unit> ;
  <http://qudt.org/schema/qudt/conversionMultiplier> 0.000001 ;
  <http://qudt.org/schema/qudt/conversionMultiplierSN> 1.0E-6 ;
  <http://qudt.org/schema/qudt/hasDimensionVector> <http://qudt.org/vocab/dimensionvector/A0E0L-2I0M0H0T0D0> ;
  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/ParticleFluence> ;
  <http://qudt.org/schema/qudt/symbol> "/km²" ;
  <http://qudt.org/schema/qudt/ucumCode> "{#}.km-2"^^<http://qudt.org/schema/qudt/UCUMcs> ;
  rdfs:isDefinedBy <http://qudt.org/2.1/vocab/unit> ;
  rdfs:label "Number per square kilometre"@en ;
.

{"resource":"Number per square kilometre" 
 ,"qname":"unit:NUM-PER-KiloM2" 
 ,"uri":"http:\/\/qudt.org\/vocab\/unit\/NUM-PER-KiloM2" 
 ,"properties":["conversion multiplier":"0.000001" 
    ,"conversion multiplier scientific":"1.0E-6" 
    ,"has dimension vector":"dimension:A0E0L-2I0M0H0T0D0" 
    ,"has quantity kind":"quantitykind:ParticleFluence" 
    ,"isDefinedBy":"<http:\/\/qudt.org\/2.1\/vocab\/unit>" 
    ,"label":"Number per square kilometre" 
    ,"symbol":"\/km²" 
    ,"type":"qudt:Unit" 
    ,"ucum code":"{#}.km-2" 
    ]}

{
  "@id" : "http://qudt.org/vocab/unit/NUM-PER-KiloM2",
  "@type" : "http://qudt.org/schema/qudt/Unit",
  "conversionMultiplier" : "0.000001",
  "conversionMultiplier:SN" : 1.0E-6,
  "hasDimensionVector" : "http://qudt.org/vocab/dimensionvector/A0E0L-2I0M0H0T0D0",
  "hasQuantityKind" : "http://qudt.org/vocab/quantitykind/ParticleFluence",
  "symbol" : "/km²",
  "ucumCode" : "{#}.km-2",
  "isDefinedBy" : "http://qudt.org/2.1/vocab/unit",
  "label" : {
    "@language" : "en",
    "@value" : "Number per square kilometre"
  },
  "@context" : {
    "conversionMultiplier" : {
      "@id" : "http://qudt.org/schema/qudt/conversionMultiplier",
      "@type" : "http://www.w3.org/2001/XMLSchema#decimal"
    },
    "conversionMultiplierSN" : {
      "@id" : "http://qudt.org/schema/qudt/conversionMultiplierSN",
      "@type" : "http://www.w3.org/2001/XMLSchema#double"
    },
    "hasDimensionVector" : {
      "@id" : "http://qudt.org/schema/qudt/hasDimensionVector",
      "@type" : "@id"
    },
    "hasQuantityKind" : {
      "@id" : "http://qudt.org/schema/qudt/hasQuantityKind",
      "@type" : "@id"
    },
    "symbol" : {
      "@id" : "http://qudt.org/schema/qudt/symbol"
    },
    "ucumCode" : {
      "@id" : "http://qudt.org/schema/qudt/ucumCode",
      "@type" : "http://qudt.org/schema/qudt/UCUMcs"
    },
    "isDefinedBy" : {
      "@id" : "http://www.w3.org/2000/01/rdf-schema#isDefinedBy",
      "@type" : "@id"
    },
    "label" : {
      "@id" : "http://www.w3.org/2000/01/rdf-schema#label"
    },
    "rdf" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "owl" : "http://www.w3.org/2002/07/owl#",
    "xsd" : "http://www.w3.org/2001/XMLSchema#",
    "rdfs" : "http://www.w3.org/2000/01/rdf-schema#"
  }
}