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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 PCE LOOP NUMBER ASSIGNMENT CLASS (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

PCE LOOP NUMBER ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

Number of the PCELoop.

Classification

Classifier

RDF Properties

"Number of the PCELoop."
"PCE LOOP NUMBER ASSIGNMENT CLASS"
"PCE LOOP NUMBER ASSIGNMENT CLASS"

Namespaces

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