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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 PIPE CONNECTOR SYMBOL (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

FLOW IN PIPE CONNECTOR SYMBOL (dexpi)

RepresentationForm

A symbol that represents an on-page pipe connector.

Specialization

Superclass

RDF Properties

"A symbol that represents an on-page pipe connector."
"FLOW IN PIPE CONNECTOR SYMBOL"
"FLOW IN PIPE CONNECTOR SYMBOL"

Namespaces

pca
http://data.posccaesar.org/rdl/
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#
rdfs
http://www.w3.org/2000/01/rdf-schema#