Hi, Adam -- Can you give us a sample of the double linked-list triples? I'd like to see how you express that in RDF.
Is this something you express in the RELS-EXT, or triples you add to the RI outside Fedora? thanks, -- Scott On 08/31/2011 02:18 PM, aj...@virginia.edu wrote: > I agree with Scott's point that "page sequences can be considered a property > of containers ... rather than a property inherent in the page object itself", > and because of a well-known updating difficulty in the RI, it is not possible > to use RDF containers in RELS-*. See: > > https://jira.duraspace.org/browse/FCREPO-656 > > There is, however, a fair way to use the RI to this end-- you can construct a > linked list, or a doubly-linked list amongst the pages. That's what we do (a > doubly-linked list). We're therefore relying on the RI to be fast, which it > is (it is, after all, an _index_-- the repository is the data store). > Updating is fairly easy (create object with two relationships, then alter > four relationships of the preceding and following pages). We have no trouble > querying into the RI for results fast enough for a page-turner presentation. > > But then, we are strongly committed to RDF for as much structural metadata as > we can cram into it. {grin} > > --- > A. Soroka > Online Library Environment > the University of Virginia Library > > > > > On Aug 31, 2011, at 2:11 PM, Scott Prater wrote: > >> Hello, Joszef -- >> >> I'll send you a couple of sample objects in a separate email. >> >>> Not to mention, that I don't really have a clear vision, how to store page >>> orders in RELS... :) >> >> Nor do we. You could store the sequence triple in the object itself, >> something along the lines of<myobject> <hasPageSequence> "1", but then >> you'd have to query every single object to build a list of pages (not a >> real big deal in the resource index, but still, a little clunky). And >> what if you forget to scan a page, and your numbering gets all whacked, >> and you have to go back and add a page later (something that occurs more >> often than we would like to admit)? You'll need to update the page >> sequence triple in every following page object. >> >> An even more subtle problem crops up if your object has one page number >> in one context (say, a plate in a book) and another page number in >> another context (say, the same plate in an art exhibit catalogue): if >> you were to create these two relations in the page object, how would you >> express in a triple that I'm page 1 of book A, and page 3 of book B? >> This is a use case which demonstrates that page sequences can be >> considered a property of containers ("I'm a book, and I have this >> content at position X"), rather than a property inherent in the page >> object itself. >> >> That would be okay, except that there's no way to express in a book >> object's RELS-EXT triple that book object A contains page object A1 with >> the attribute page sequence "1". You can do that in METS, though. >> >> -- Scott >> >> >> -- >> Scott Prater >> Library, Instructional, and Research Applications (LIRA) >> Division of Information Technology (DoIT) >> University of Wisconsin - Madison >> pra...@wisc.edu >> >> ------------------------------------------------------------------------------ >> Special Offer -- Download ArcSight Logger for FREE! >> Finally, a world-class log management solution at an even better >> price-free! And you'll get a free "Love Thy Logs" t-shirt when you >> download Logger. Secure your free ArcSight Logger TODAY! >> http://p.sf.net/sfu/arcsisghtdev2dev >> _______________________________________________ >> Fedora-commons-users mailing list >> Fedora-commons-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/fedora-commons-users > > > ------------------------------------------------------------------------------ > Special Offer -- Download ArcSight Logger for FREE! > Finally, a world-class log management solution at an even better > price-free! And you'll get a free "Love Thy Logs" t-shirt when you > download Logger. Secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsisghtdev2dev > _______________________________________________ > Fedora-commons-users mailing list > Fedora-commons-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/fedora-commons-users -- Scott Prater Library, Instructional, and Research Applications (LIRA) Division of Information Technology (DoIT) University of Wisconsin - Madison pra...@wisc.edu ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Fedora-commons-users mailing list Fedora-commons-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/fedora-commons-users
