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

http://sandbox.dexpi.org/rdl/Iso6708ObjectDn900

ISO 6708 OBJECT DN 900 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 900 provided by ISO 6708.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 900 provided by ISO 6708."
"ISO 6708 OBJECT DN 900"
"ISO 6708 OBJECT DN 900"

Namespaces

dexpi
http://sandbox.dexpi.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#
pca
http://data.posccaesar.org/rdl/
rdfs
http://www.w3.org/2000/01/rdf-schema#