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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 OUT 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/FlowOutPipingClassCodeAssignmentClass

FLOW OUT PIPING CLASS CODE ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

A class to assign the piping class behind value.

Classification

Classifier

RDF Properties

"A class to assign the piping class behind value."
"FLOW OUT PIPING CLASS CODE ASSIGNMENT CLASS"
"FLOW OUT PIPING CLASS CODE 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#