Thanks, Scott-- that's kind of you to say. The committers are probably tired of hearing me say this, but this is a good example of where making available as a closer-to-the-core service the Enhanced Content Model "Views" facility would really help create a nice solution. As our system stands, UI and workflow programmers are a bit more exposed to SPARQL in the raw than I would prefer. That hasn't been a pressing problem, because our UI and workflow programmers are such fantastic people, but it would be lovely to be able to package the pages of a book as a view on that book, or to see a view from a given page of the following pages, etc., and coming to more complex structures, it could really help us find our way through complex resource graphs.
--- A. Soroka Online Library Environment the University of Virginia Library On Aug 31, 2011, at 3:41 PM, Scott Prater wrote: > That is an elegant solution to the problem. > > -- Scott > > On 08/31/2011 02:35 PM, aj...@virginia.edu wrote: >> Below is a section of RDF from a page-object. We keep this right in RELS-EXT >> and let Fedora do the work of updating for us. >> >> --- >> A. Soroka >> Online Library Environment >> the University of Virginia Library >> >> <rdf:RDF ... xmlns:uva="http://fedora.lib.virginia.edu/relationships#";> >> <rdf:Description rdf:about="info:fedora/uva-lib:1038869"> >> ... >> <uva:hasPreceedingPage >> rdf:resource="info:fedora/uva-lib:1038868"/> >> <uva:isFollowingPageOf >> rdf:resource="info:fedora/uva-lib:1038868"/> >> <uva:hasFollowingPage >> rdf:resource="info:fedora/uva-lib:1038870"/> >> <uva:isPreceedingPageOf >> rdf:resource="info:fedora/uva-lib:1038870"/> >> ... >> </rdf:Description> >> </rdf:RDF> >> >> On Aug 31, 2011, at 3:25 PM, Scott Prater wrote: >> >>> 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 > > > -- > 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
