Hi Philip, > More information here: > > https://wiki.gnome.org/Projects/Tracker/Documentation/Examples/SPARQL/Email
Actually, moving from there "back to the top" (https://wiki.gnome.org/Projects/Tracker/Documentation/) is what gave me the important information (though at the end): "Original NEPOMUK ontologies <http://www.semanticdesktop.org/ontologies/>" vs. "Tracker version of the NEPOMUK ontologies <http://library.gnome.org/devel/ontology/unstable/>". If I had read that before, I wouldn't have started this thread about "a mail not being a document". So Martyn's solution to change the query in tracker-needle is, of course, the proper solution for the tracker project. If this change finally reaches my Linux distribution I'll be happy and everything is well. Nevertheless, I'd like to add an outsider's personal impression. If it is inappropriate for this mailing list, I apologize. Though I have learned a bit about the ideas of the "semantic web" as an approach to "share information between applications" in these last few days, I doubt that the idea will really take off if the participating parties cannot agree on a data model for the information to be shared. Your remark "Our NMO ontology is indeed not the same as Nepomuk. That's because Nepomuk's is incomplete." leaves me with the strong impress that some philosophical struggle is going on behind the scenes. The fact that both parties involved claim exactly the same formal namespace (!) (@prefix nfo: <http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#> in 33-nfo.ontology and xmlns:nfo="http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#"; in semantic desktop's files) deepens this impression. >From what I have grasped so far, it would probably be a much better idea to have tracker-needle implementing the search field in gnome-shell than all those search plugins popping up now. But as a programmer I wonder whether tracker is firm enough ground and whether I should invest time in implementing tracker miners for additional items or a gnome-shell plugin for searching my mails. - Michael
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