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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:SpecializationHassubclassAnglePlugValveHassuperclassValve to be used in DEXPI-compliant Proteus files starts with http - as shown below:
http://sandbox.dexpi.org/rdl/SpecializationHassubclassAnglePlugValveHassuperclassValve
dexpi:SpecializationHassubclassAnglePlugValveHassuperclassValve
RDF Properties
Namespaces
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
dexpi
http://sandbox.dexpi.org/rdl/
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
pca
http://data.posccaesar.org/rdl/