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

http://sandbox.dexpi.org/rdl/Din2448ObjectDn15

DIN 2448 OBJECT DN 15 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 15 provided by DIN 2448.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 15 provided by DIN 2448."
"DIN 2448 OBJECT DN 15"
"DIN 2448 OBJECT DN 15"

Namespaces

dexpi
http://sandbox.dexpi.org/rdl/
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
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#