2007/5/19, Joe Shaw <<a href="mailto:joe@joeshaw.org">joe@joeshaw.org</a>>:<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi, On 5/19/07, Mikkel Kamstrup Erlandsen <<a href="mailto:mikkel.kamstrup@gmail.com">mikkel.kamstrup@gmail.com</a>> wrote: > Would the HitType/FileType structure of Beagle not be implicit with a > Category structure like this: > <a href="http://www.grillbar.org/xesam/object-tree.png">http://www.grillbar.org/xesam/object-tree.png</a> (this is not > the old example again)? Especially if you couple this with a Field->Category > map (such that, fx, only Objects of category File has the ExactFileName > field set) like the Strigi/Nepomuk camp want. Atleast it seem to cover the > examples so far. Where does an audio email attachment fall in here?  If being a subclass of "File" implies an ExactFilename property, this doesn't work.</blockquote><div> Right. That was not entirely thought through. I must admit that I find <a href="http://beagle-project.org/Writing_clients">http://beagle-project.org/Writing_clients</a> a bit confusing though. As far as I can tell from your words here I gather that Beagles HitType means "this-is-a" and that the FileType means "this-comes-from", but that's not how I read that site (fx. Document is a FileType whereas I would expect it to be a HitType with FileType=File). I've tried to come up with a system that should include Beagles current system in a more clear way. The idea is that an indexed object has three has three things: One Category, One Source, and N Fields (for N>=0). The Category  is what Beagle calls HitType. The Source is where the object originates from, a more general thing than Beagles FileType. Fields are "properties" that are available according to the spec of the category and the source. </div> I have another sketch here : <a href="http://grillbar.org/xesam/cat-source-field.png">http://grillbar.org/xesam/cat-source-field.png</a> Then fx there could be a SourceURI field so that you could determine that a given image with source=Archive was from a zip file attached to and email... Cheers, Mikkel </div>