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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 ON HOLD SPECIALIZATION (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

ON HOLD SPECIALIZATION (dexpi)

ClassOfSpecialization

RDF Properties

"ON HOLD SPECIALIZATION"
"ON HOLD SPECIALIZATION"

Namespaces

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