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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 INSTRUMENTATION LOOP FUNCTION (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

INSTRUMENTATION LOOP FUNCTION (dexpi)

ClassOfActivity

An identified collection of related PROCESS CONTROL REQUIREMENTs that interact for a known purpose.

Specialization

Superclass

RDF Properties

"An identified collection of related PROCESS CONTROL REQUIREMENTs that interact for a known purpose."
"INSTRUMENTATION LOOP FUNCTION"
"INSTRUMENTATION LOOP FUNCTION"

Namespaces

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