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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 FLOW IN PIPING CLASS CODE ASSIGNMENT CLASS (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

FLOW IN PIPING CLASS CODE ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

A class to assign the piping class in front of value.

Classification

Classifier

RDF Properties

"A class to assign the piping class in front of value."
"FLOW IN PIPING CLASS CODE ASSIGNMENT CLASS"
"FLOW IN PIPING CLASS CODE ASSIGNMENT CLASS"

Namespaces

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