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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 ISO 6708 OBJECT DN 20 (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/Iso6708ObjectDn20
ISO 6708 OBJECT DN 20 (dexpi)
ClassOfInanimatePhysicalObject
An object conforming to the specification for pipes nominal size DN 20 provided by ISO 6708.
Specialization
Superclass
RDF Properties
"An object conforming to the specification for pipes nominal size DN 20 provided by ISO 6708."
"ISO 6708 OBJECT DN 20"
"ISO 6708 OBJECT DN 20"
Namespaces
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
dexpi
http://sandbox.dexpi.org/rdl/
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#