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
