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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 SINGLE FLOW PIPING NETWORK SEGMENT (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

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

SINGLE FLOW PIPING NETWORK SEGMENT (dexpi)

ClassOfInanimatePhysicalObject

A piping network segment that does not enable dual flow.

Specialization

Superclass

RDF Properties

"A piping network segment that does not enable dual flow."
"SINGLE FLOW PIPING NETWORK SEGMENT"
"SINGLE FLOW PIPING NETWORK SEGMENT"

Namespaces

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