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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 50 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/Din2448ObjectDn50
DIN 2448 OBJECT DN 50 (dexpi)
ClassOfInanimatePhysicalObject
An object conforming to the specification for pipes nominal size DN 50 provided by DIN 2448.
Specialization
Superclass
RDF Properties
"An object conforming to the specification for pipes nominal size DN 50 provided by DIN 2448."
"DIN 2448 OBJECT DN 50"
"DIN 2448 OBJECT DN 50"
Namespaces
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
rdfs
http://www.w3.org/2000/01/rdf-schema#
pca
http://data.posccaesar.org/rdl/
dexpi
http://sandbox.dexpi.org/rdl/