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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 16 BAR ARTEFACT (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/Class16BarArtefact

CLASS 16 BAR ARTEFACT (dexpi)

ClassOfInanimatePhysicalObject

An artefact conforming to the specification for a nominal pressure of 16 BAR.

RDF Properties

"An artefact conforming to the specification for a nominal pressure of 16 BAR."
"CLASS 16 BAR ARTEFACT"
"CLASS 16 BAR ARTEFACT"

Namespaces

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