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

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

LOCATION ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

Location of the PCE Request. Can be Central, Panel or Field. Attribute of PCE Request

Classification

Classifier

RDF Properties

"Location of the PCE Request. Can be Central, Panel or Field. Attribute of PCE Request"
"LOCATION ASSIGNMENT CLASS"
"LOCATION 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/
rdfs
http://www.w3.org/2000/01/rdf-schema#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#