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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 DIN 2448 OBJECT (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/Din2448Object

DIN 2448 OBJECT (dexpi)

ClassOfInanimatePhysicalObject

A class of inanimate physical object conforming to DIN 2448.

Specialization

Subclass

Superclass

RDF Properties

"A class of inanimate physical object conforming to DIN 2448."
"DIN 2448 OBJECT"
"DIN 2448 OBJECT"

Namespaces

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