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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 ISO 6708 OBJECT DN 450 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/Iso6708ObjectDn450
ISO 6708 OBJECT DN 450 (dexpi)
ClassOfInanimatePhysicalObject
An object conforming to the specification for pipes nominal size DN 450 provided by ISO 6708.
Specialization
Superclass
RDF Properties
"An object conforming to the specification for pipes nominal size DN 450 provided by ISO 6708."
"ISO 6708 OBJECT DN 450"
"ISO 6708 OBJECT DN 450"
Namespaces
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
dexpi
http://sandbox.dexpi.org/rdl/
rdfs
http://www.w3.org/2000/01/rdf-schema#
pca
http://data.posccaesar.org/rdl/