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

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

PCE REQUEST NUMBER ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

Number of the PCERequest. Attribute of PCE Request.

Classification

Classifier

RDF Properties

"Number of the PCERequest. Attribute of PCE Request."
"PCE REQUEST NUMBER ASSIGNMENT CLASS"
"PCE REQUEST 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#