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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 PORT STATUS SPECIALIZATION (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/PortStatusSpecialization
PORT STATUS SPECIALIZATION (dexpi)
RDF Properties
"PORT STATUS SPECIALIZATION"
"PORT STATUS SPECIALIZATION"
Namespaces
pca
http://data.posccaesar.org/rdl/
dexpi
http://sandbox.dexpi.org/rdl/
rdfs
http://www.w3.org/2000/01/rdf-schema#