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

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

DEXPI IDENTIFICATION CLASS OF CLASS (dexpi)

ClassOfClass

An identification class of class defined by DEXPI.

Specialization

Superclass

Classification

Classified

RDF Properties

"An identification class of class defined by DEXPI."
"DEXPI IDENTIFICATION CLASS OF CLASS"
"DEXPI IDENTIFICATION CLASS OF CLASS"

Namespaces

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