I am studying the article "Mapping of a functional design of a control loop"
In the appended rdf-file "control-loop.rdf", in the definition for the function blocks FT-5703, FIC 5703, FPV-5703, etc.

for example
<!-- Declaration of FT-5703 -->
<dm:ClassOfFunctionalObject rdf:ID="C2df9a810-c872-11e3-9c1a-0800200c9a66">
<rdf:type rdf:resource="&owl;Class"/>
<rdfs:subClassOf rdf:resource="&rdl;RDS6409401"/> <!-- CONTROL FUNCTION BLOCK IN-A -->
<skos:prefLabel>FT-5703</skos:prefLabel>
<meta:valEffectiveDate rdf:datatype="&xsd;dateTime">2013-09-15T13:29:00Z</meta:valEffectiveDate>
</dm:ClassOfFunctionalObject>

I do not find the reference e.g. "RDS6409401" for <!-- CONTROL FUNCTION BLOCK IN-A -->
at "http://data.posccaesar.org/rdl/" or in the downloaded file "RDL.owl"

Are all the RDS for CONTROL FUNCTION BLOCK IN-A, CONTROL FUNCTION BLOCK OUT-A, CONTROL FUNCTION BLOCK CS, etc. as mentioned in the document "Mapping of a functional design of a control loop" discarded ?
Which RDS can I take for the function blocks CONTROL FUNCTION BLOCK IN-A, CONTROL FUNCTION BLOCK OUT-A, CONTROL FUNCTION BLOCK CS, etc.

I ask since I want to study the RDL, I think it is one of the barrier that make troubles to the user, who want to apply ISO 15926: poorly documented, changed without any notation

Thank

Nguyen