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

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

DEXPI EQUIPMENT COMPONENT CLASS (dexpi)

ClassOfClassOfIndividual

An equipment component class defined by DEXPI.

Specialization

Superclass

Classification

Classified

RDF Properties

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

Namespaces

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