<?xml version="1.0" encoding="utf-8"?><rdf:RDF  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"  xmlns:skos="http://www.w3.org/2004/02/skos/core#"  xmlns:map="http://www.w3c.rl.ac.uk/2003/11/21-skos-mapping#"  xmlns:dct="http://purl.org/dc/terms/"  xmlns:dc="http://purl.org/dc/elements/1.1/"><skos:ConceptScheme rdf:about="https://digilab.ptb.de/dkd/refType/vocab/">  <dc:title>Metrology Database</dc:title>  <dc:creator>German Calibration Service (DKD)</dc:creator>  <dc:contributor>Thomas Krah, Daniel Hutzschenreuter, Benjamin Gloger, Muhammed-Ali Demir, Moritz Jordan</dc:contributor>  <dc:publisher>Deutscher Kalibrierdienst (German Calibration Service)</dc:publisher>  <dc:rights></dc:rights>  <dc:subject>metrology, reference types, digital calibration certificate, certificate of conformity</dc:subject>  <dc:description><![CDATA[  ]]></dc:description>  <dc:date>2023-06-19</dc:date>  <dct:modified>2026-05-29 12:05:29</dct:modified>  <dc:language>en-US</dc:language>  </skos:ConceptScheme>  <skos:Concept rdf:about="https://digilab.ptb.de/dkd/refType/vocab/skos/541"><skos:prefLabel xml:lang="en-US">pressureType</skos:prefLabel> <skos:definition xml:lang="de">Druckart; diese kann einen der folgenden 4 Werte annehmen:

„vacuum“, für die Kalibrierung eines Vakuummessgerätes nach z.B. ISO 3567
„absolute pressure“, Absolutdruckmessgerät kalibriert nach z.B. DKD-R 6-1
„gauge pressure“, Überdruckmessgerät kalibriert nach z.B. DKD-R 6-1
„differential pressure“, Differenzdruckmessgerät kalibriert nach z.B. DKD-R 6-1
 </skos:definition> <skos:definition xml:lang="en-US">pressure type, which can take one of the following 4 values:

“vacuum”, for the calibration of a vacuum gauge in accordance with for example ISO 3567
“absolute pressure”, absolute pressure gauge calibrated in accordance with for example DKD-R 6-1
“gauge pressure”, gauge pressure calibrated in accordance with for example DKD-R 6-1
“differential pressure”, differential pressure gauge calibrated in accordance with for example DKD-R 6-1
 </skos:definition> <skos:historyNote xml:lang="en-US">2026-04-15
created </skos:historyNote><skos:inScheme rdf:resource="https://digilab.ptb.de/dkd/refType/vocab/"/><skos:broader rdf:resource="https://digilab.ptb.de/dkd/refType/vocab/skos/263"/>  <dct:created>2026-04-15 14:15:57</dct:created>  </skos:Concept></rdf:RDF>