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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 20 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/Din2448ObjectDn20
DIN 2448 OBJECT DN 20 (dexpi)
ClassOfInanimatePhysicalObject
An object conforming to the specification for pipes nominal size DN 20 provided by DIN 2448.
Specialization
Superclass
RDF Properties
"An object conforming to the specification for pipes nominal size DN 20 provided by DIN 2448."
"DIN 2448 OBJECT DN 20"
"DIN 2448 OBJECT DN 20"
Namespaces
dexpi
http://sandbox.dexpi.org/rdl/
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
pca
http://data.posccaesar.org/rdl/
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
rdfs
http://www.w3.org/2000/01/rdf-schema#