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:j.1="http://www.w3.org/2004/02/skos/core#"
    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/constant/ProtonMass">
    <rdf:type rdf:resource="http://qudt.org/schema/qudt/PhysicalConstant"/>
    <j.0:hasQuantityKind rdf:resource="http://qudt.org/vocab/quantitykind/Mass"/>
    <j.0:informativeReference rdf:datatype="http://www.w3.org/2001/XMLSchema#anyURI">http://physics.nist.gov/cuu/Constants/bibliography.html</j.0:informativeReference>
    <j.0:quantityValue rdf:resource="http://qudt.org/vocab/constant/Value_ProtonMass"/>
    <j.0:ucumCode rdf:datatype="http://qudt.org/schema/qudt/UCUMcs">[m_p]</j.0:ucumCode>
    <rdfs:isDefinedBy rdf:resource="http://qudt.org/3.1.0/vocab/constant"/>
    <rdfs:label xml:lang="en">proton mass</rdfs:label>
    <j.1:closeMatch rdf:resource="http://dbpedia.org/resource/Proton"/>
  </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/constant/ProtonMass>
  rdf:type <http://qudt.org/schema/qudt/PhysicalConstant> ;
  <http://qudt.org/schema/qudt/hasQuantityKind> <http://qudt.org/vocab/quantitykind/Mass> ;
  <http://qudt.org/schema/qudt/informativeReference> "http://physics.nist.gov/cuu/Constants/bibliography.html"^^xsd:anyURI ;
  <http://qudt.org/schema/qudt/quantityValue> <http://qudt.org/vocab/constant/Value_ProtonMass> ;
  <http://qudt.org/schema/qudt/ucumCode> "[m_p]"^^<http://qudt.org/schema/qudt/UCUMcs> ;
  rdfs:isDefinedBy <http://qudt.org/3.1.0/vocab/constant> ;
  rdfs:label "proton mass"@en ;
  <http://www.w3.org/2004/02/skos/core#closeMatch> <http://dbpedia.org/resource/Proton> ;
.

{"resource":"proton mass" 
 ,"qname":"constant:ProtonMass" 
 ,"uri":"http:\/\/qudt.org\/vocab\/constant\/ProtonMass" 
 ,"properties":["has close match":"<http:\/\/dbpedia.org\/resource\/Proton>" 
    ,"has quantity kind":"quantitykind:Mass" 
    ,"informative reference":"http:\/\/physics.nist.gov\/cuu\/Constants\/bibliography.html" 
    ,"isDefinedBy":"<http:\/\/qudt.org\/3.1.0\/vocab\/constant>" 
    ,"label":"proton mass" 
    ,"quantity value":"constant:Value_ProtonMass" 
    ,"type":"qudt:PhysicalConstant" 
    ,"ucum code":"[m_p]" 
    ]}

{
  "@id" : "http://qudt.org/vocab/constant/ProtonMass",
  "@type" : "http://qudt.org/schema/qudt/PhysicalConstant",
  "hasQuantityKind" : "http://qudt.org/vocab/quantitykind/Mass",
  "informativeReference" : "http://physics.nist.gov/cuu/Constants/bibliography.html",
  "quantityValue" : "http://qudt.org/vocab/constant/Value_ProtonMass",
  "ucumCode" : "[m_p]",
  "isDefinedBy" : "http://qudt.org/3.1.0/vocab/constant",
  "label" : {
    "@language" : "en",
    "@value" : "proton mass"
  },
  "closeMatch" : "http://dbpedia.org/resource/Proton",
  "@context" : {
    "hasQuantityKind" : {
      "@id" : "http://qudt.org/schema/qudt/hasQuantityKind",
      "@type" : "@id"
    },
    "informativeReference" : {
      "@id" : "http://qudt.org/schema/qudt/informativeReference",
      "@type" : "http://www.w3.org/2001/XMLSchema#anyURI"
    },
    "quantityValue" : {
      "@id" : "http://qudt.org/schema/qudt/quantityValue",
      "@type" : "@id"
    },
    "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"
    },
    "closeMatch" : {
      "@id" : "http://www.w3.org/2004/02/skos/core#closeMatch",
      "@type" : "@id"
    },
    "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#"
  }
}