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

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

DEXPI EQUIPMENT CLASS (dexpi)

ClassOfClassOfIndividual

An equipment class defined by DEXPI.

Specialization

Superclass

Classification

Classified

RDF Properties

"An equipment class defined by DEXPI."
"DEXPI EQUIPMENT CLASS"
"DEXPI EQUIPMENT CLASS"

Namespaces

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