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

http://sandbox.dexpi.org/rdl/Iso6708ObjectDn600

ISO 6708 OBJECT DN 600 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 600 provided by ISO 6708.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 600 provided by ISO 6708."
"ISO 6708 OBJECT DN 600"
"ISO 6708 OBJECT DN 600"

Namespaces

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