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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 NO HEAT TRACING SYSTEM (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

NO HEAT TRACING SYSTEM (dexpi)

ClassOfInanimatePhysicalObject

An artefact that is no heat tracing system.

Specialization

Superclass

RDF Properties

"An artefact that is no heat tracing system."
"NO HEAT TRACING SYSTEM"
"NO HEAT TRACING SYSTEM"

Namespaces

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