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

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

SIGNAL PROCESS CONTROL FUNCTIONS ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

A class to assign process control functions.

Classification

Classifier

RDF Properties

"A class to assign process control functions."
"SIGNAL PROCESS CONTROL FUNCTIONS ASSIGNMENT CLASS"
"SIGNAL PROCESS CONTROL FUNCTIONS ASSIGNMENT CLASS"

Namespaces

p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
pca
http://data.posccaesar.org/rdl/
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#