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

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

ACTUATING SYSTEM (dexpi)

ClassOfFunctionalObject

An assembly of artefacts that is designed to fulfill an ACTING PROCESS CONTROL REQUIREMENT.

Specialization

Superclass

RDF Properties

"An assembly of artefacts that is designed to fulfill an ACTING PROCESS CONTROL REQUIREMENT."
"ACTUATING SYSTEM"
"ACTUATING SYSTEM"

Namespaces

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