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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 PROCESS SIGNAL GENERATING SYSTEM NUMBER ASSIGNMENT CLASS (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

PROCESS SIGNAL GENERATING SYSTEM NUMBER ASSIGNMENT CLASS (dexpi)

ClassOfClassOfIdentification

Classification

Classifier

RDF Properties

"PROCESS SIGNAL GENERATING SYSTEM NUMBER ASSIGNMENT CLASS"
"PROCESS SIGNAL GENERATING SYSTEM NUMBER ASSIGNMENT CLASS"

Namespaces

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