On 2 May 2011, at 08:45, Christoph Höger wrote:

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> Hi all,

Hi Christoph,

Minor suggestion:

>  ?a rdf:type modelica:Port .
>  ?b rdf:type modelica:Port .
>  ?c rdf:type modelica:Port .
>  ?a modelica:connect ?b .
>  ?b modelica:connect ?a .
>  ?b modelica:connect ?c .
>  ?c modelica:connect ?b .
>  filter not exists  {
>    ?a modelica:connect ?c .
>  }
>  filter not exists  {
>    ?c modelica:connect ?a .
>  }

I think you want MINUS here, rather than 'filter not exists'.

Damian

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