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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 DIN 2448 OBJECT DN 80 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/Din2448ObjectDn80

DIN 2448 OBJECT DN 80 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 80 provided by DIN 2448.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 80 provided by DIN 2448."
"DIN 2448 OBJECT DN 80"
"DIN 2448 OBJECT DN 80"

Namespaces

rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
dexpi
http://sandbox.dexpi.org/rdl/
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#