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The URL (web address) shown by your browser starts with https because you visit this site using a secured connection. Note that the URI reference (identifier) of CLASS 4500 PSI ARTEFACT (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/Class4500PsiArtefact

CLASS 4500 PSI ARTEFACT (dexpi)

ClassOfInanimatePhysicalObject

An artefact conforming to the specification for a nominal pressure of 4500 PSI.

RDF Properties

"An artefact conforming to the specification for a nominal pressure of 4500 PSI."
"CLASS 4500 PSI ARTEFACT"
"CLASS 4500 PSI ARTEFACT"

Namespaces

dexpi
http://sandbox.dexpi.org/rdl/
rdfs
http://www.w3.org/2000/01/rdf-schema#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
pca
http://data.posccaesar.org/rdl/
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#