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

http://sandbox.dexpi.org/rdl/Iso6708ObjectDn150

ISO 6708 OBJECT DN 150 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 150 provided by ISO 6708.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 150 provided by ISO 6708."
"ISO 6708 OBJECT DN 150"
"ISO 6708 OBJECT DN 150"

Namespaces

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#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
pca
http://data.posccaesar.org/rdl/