@prefix qudt:  <http://qudt.org/schema/qudt#> .
@prefix ssd:   <http://www.w3.org/ns/sparql-service-description#> .
@prefix owl:   <http://www.w3.org/2002/07/owl#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .
@prefix skos:  <http://www.w3.org/2004/02/skos/core#> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix qudt-unit: <http://qudt.org/vocab/unit#> .
@prefix qb:    <http://purl.org/linked-data/cube#> .
@prefix dgu:   <http://reference.data.gov.uk/def/reference/> .
@prefix ui:    <http://purl.org/linked-data/registry-ui#> .
@prefix dct:   <http://purl.org/dc/terms/> .
@prefix reg:   <http://purl.org/linked-data/registry#> .
@prefix qudt-quantity: <http://qudt.org/vocab/quantity#> .
@prefix grib2-parameter: <http://codes.wmo.int/grib2/schema/parameter/> .
@prefix api:   <http://purl.org/linked-data/api/vocab#> .
@prefix vann:  <http://purl.org/vocab/vann/> .
@prefix prov:  <http://www.w3.org/ns/prov#> .
@prefix foaf:  <http://xmlns.com/foaf/0.1/> .
@prefix common-unit: <http://codes.wmo.int/common/schema/unit/> .
@prefix cc:    <http://creativecommons.org/ns#> .
@prefix grib2-core: <http://codes.wmo.int/grib2/schema/core/> .
@prefix void:  <http://rdfs.org/ns/void#> .
@prefix version: <http://purl.org/linked-data/version#> .
@prefix bufr4-core: <http://codes.wmo.int/bufr4/schema/core/> .
@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ldp:   <http://www.w3.org/ns/ldp#> .
@prefix time:  <http://www.w3.org/2006/time#> .
@prefix qudt-dimension: <http://qudt.org/vocab/dimension#> .
@prefix vs:    <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
@prefix common-core: <http://codes.wmo.int/common/schema/core/> .
@prefix dc:    <http://purl.org/dc/elements/1.1/> .

<http://codes.wmo.int/wmdr/ReferenceTime/inapplicable>
        a                skos:Concept ;
        rdfs:label       "inapplicable" ;
        dct:description  "None of the codes in the table are applicable in the context of this particular observation."@en ;
        skos:notation    "inapplicable" .

<http://codes.wmo.int/wmdr/ReferenceTime>
        a                      ldp:Container , reg:Register , skos:Collection ;
        rdfs:label             "Reference time" ;
        dct:description        "Reference time" ;
        dct:modified           "2019-11-21T09:14:29.877Z"^^xsd:dateTime ;
        owl:versionInfo        2 ;
        skos:member            <http://codes.wmo.int/wmdr/ReferenceTime/timeServer> , <http://codes.wmo.int/wmdr/ReferenceTime/manualComparison> , <http://codes.wmo.int/wmdr/ReferenceTime/radioClock> , <http://codes.wmo.int/wmdr/ReferenceTime/inapplicable> , <http://codes.wmo.int/wmdr/ReferenceTime/unknown> , <http://codes.wmo.int/wmdr/ReferenceTime/gnss> ;
        ldp:hasMemberRelation  skos:member .

<http://codes.wmo.int/wmdr/ReferenceTime/unknown>
        a                skos:Concept ;
        rdfs:label       "unknown" ;
        dct:description  "Source of reference time unknown"@en ;
        skos:notation    "unknown" .

<http://codes.wmo.int/wmdr/ReferenceTime/timeServer>
        a                skos:Concept ;
        rdfs:label       "Time server (internet based)" ;
        dct:description  "A server computer that reads the actual time from a reference/atomic clock and distributes this information to its clients using a computer network. The time server may be a local network time server or an internet time server."@en ;
        skos:notation    "timeServer" .

<http://codes.wmo.int/wmdr/ReferenceTime/gnss>
        a                skos:Concept ;
        rdfs:label       "Global navigation satellite system (GNSS)" ;
        dct:description  "A Global Navigation Satellite System (GNSS) signal controlled clock, which receives a signal that comes from the atomic clock of a GNSS constellation of satellites."@en ;
        skos:notation    "gnss" .

<http://codes.wmo.int/wmdr/ReferenceTime/radioClock>
        a                skos:Concept ;
        rdfs:label       "Radio clock" ;
        dct:description  "A radio controlled clock, which receives a radio signal that comes from a reference/atomic clock."@en ;
        skos:notation    "radioClock" .

<http://codes.wmo.int/wmdr/ReferenceTime/manualComparison>
        a                skos:Concept ;
        rdfs:label       "Manual comparison" ;
        dct:description  "A regular procedure of manual comparison with a reference clock"@en ;
        skos:notation    "manualComparison" .