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

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

CENTRAL LOCATION (dexpi)

A central location.

RDF Properties

"A central location."
"CENTRAL LOCATION"
"CENTRAL LOCATION"

Namespaces

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