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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 CONNECTION NOMINAL DIAMETER NUMERICAL VALUE REPRESENTATION ASSIGNMENT CLASS (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

CONNECTION NOMINAL DIAMETER NUMERICAL VALUE REPRESENTATION ASSIGNMENT CLASS (dexpi)

RDF Properties

"CONNECTION NOMINAL DIAMETER NUMERICAL VALUE REPRESENTATION ASSIGNMENT CLASS"
"CONNECTION NOMINAL DIAMETER NUMERICAL VALUE REPRESENTATION ASSIGNMENT CLASS"

Namespaces

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