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

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

DEXPI DESCRIPTION CLASS OF CLASS (dexpi)

ClassOfClass

A description class of class defined by DEXPI.

Specialization

Superclass

Classification

Classified

RDF Properties

"A description class of class defined by DEXPI."
"DEXPI DESCRIPTION CLASS OF CLASS"
"DEXPI DESCRIPTION CLASS OF CLASS"

Namespaces

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