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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 DN 65 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/Din2448ObjectDn65

DIN 2448 OBJECT DN 65 (dexpi)

ClassOfInanimatePhysicalObject

An object conforming to the specification for pipes nominal size DN 65 provided by DIN 2448.

Specialization

Superclass

RDF Properties

"An object conforming to the specification for pipes nominal size DN 65 provided by DIN 2448."
"DIN 2448 OBJECT DN 65"
"DIN 2448 OBJECT DN 65"

Namespaces

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