BaseX generate-id()

On Mon, May 20, 2013 at 10:09 PM, James Wright <james.jw at hotmail.com> wrote: > In the W3C specs it says this method should generate the same ID for a node > regardless of when its called. Is this how it is implemented in BaseX or > does it simply generate a random number? My testing seems to implicate the > ladder. If it does generate the same ID for each node each time its run, > does it do ensure uniqueness at the db or resource level? > > Thx for your time. > - James > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

On Mon, May 20, 2013 at 10:46 PM, James Wright <james.jw at hotmail.com> wrote: > How did I not notice this!! I have read through those modules so many times > now!! I think this is exactly what I was looking for. I expected there to be > some sort of persistent id because I skimmed the initial dissertation on > BaseX from several years ago and it talks about a persistent ID. In regards > to the 'pre' this ID represents the id of a node which 'hasn't' been > inserted yet but it does not necessarily denote the ID the node will take > when actually inserted... So whats the point? Is this more for internal > uses? Maybe I don't fully understand... > > Thanks for the quick reply! > > - James > >> From: christian.gruen at gmail.com >> Date: Mon, 20 May 2013 22:30:08 +0200 >> Subject: Re: [basex-talk] BaseX generate-id() >> To: james.jw at hotmail.com >> CC: basex-talk at mailman.uni-konstanz.de > >> >> Hi James, >> >> a node id generated via generate-id() is unique and the same during >> the runtime of a query. If you want to ensure that you are requesting >> the same nodes of a database, I recommend you to check out the >> node-id() and node-pre() functions of our database module [1]. >> >> Hope this helps, >> Christian >> >> [1] http://docs.basex.org/wiki/Database_Module >> ___________________________ >> >> On Mon, May 20, 2013 at 10:09 PM, James Wright <james.jw at hotmail.com> >> wrote: >> > In the W3C specs it says this method should generate the same ID for a >> > node >> > regardless of when its called. Is this how it is implemented in BaseX or >> > does it simply generate a random number? My testing seems to implicate >> > the >> > ladder. If it does generate the same ID for each node each time its run, >> > does it do ensure uniqueness at the db or resource level? >> > >> > Thx for your time. >> > - James >> > >> > _______________________________________________ >> > BaseX-Talk mailing list >> > BaseX-Talk at mailman.uni-konstanz.de >> > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >> >

> From: christian.gruen at gmail.com > Date: Mon, 20 May 2013 23:50:18 +0200 > Subject: Re: [basex-talk] BaseX generate-id() > To: james.jw at hotmail.com; basex-talk at mailman.uni-konstanz.de > > I’m not quite sure on what you were asking, but I noticed that the > explanation of PRE and ID values in our Wiki was somewhat deficient. > Please don‘t hesitate to have yet another look at the revised articles > [1,2], which are hopefully more self-explanatory. If not, you are > always invited to read the dissertation in more detail ;) > > [1] http://docs.basex.org/wiki/Database_Module#db:open-pre > [2] http://docs.basex.org/wiki/Node_Storage > _______________________________ > > On Mon, May 20, 2013 at 10:46 PM, James Wright <james.jw at hotmail.com> wrote: > > How did I not notice this!! I have read through those modules so many times > > now!! I think this is exactly what I was looking for. I expected there to be > > some sort of persistent id because I skimmed the initial dissertation on > > BaseX from several years ago and it talks about a persistent ID. In regards > > to the 'pre' this ID represents the id of a node which 'hasn't' been > > inserted yet but it does not necessarily denote the ID the node will take > > when actually inserted... So whats the point? Is this more for internal > > uses? Maybe I don't fully understand... > > > > Thanks for the quick reply! > > > > - James > > > >> From: christian.gruen at gmail.com > >> Date: Mon, 20 May 2013 22:30:08 +0200 > >> Subject: Re: [basex-talk] BaseX generate-id() > >> To: james.jw at hotmail.com > >> CC: basex-talk at mailman.uni-konstanz.de > > > >> > >> Hi James, > >> > >> a node id generated via generate-id() is unique and the same during > >> the runtime of a query. If you want to ensure that you are requesting > >> the same nodes of a database, I recommend you to check out the > >> node-id() and node-pre() functions of our database module [1]. > >> > >> Hope this helps, > >> Christian > >> > >> [1] http://docs.basex.org/wiki/Database_Module > >> ___________________________ > >> > >> On Mon, May 20, 2013 at 10:09 PM, James Wright <james.jw at hotmail.com> > >> wrote: > >> > In the W3C specs it says this method should generate the same ID for a > >> > node > >> > regardless of when its called. Is this how it is implemented in BaseX or > >> > does it simply generate a random number? My testing seems to implicate > >> > the > >> > ladder. If it does generate the same ID for each node each time its run, > >> > does it do ensure uniqueness at the db or resource level? > >> > > >> > Thx for your time. > >> > - James > >> > > >> > _______________________________________________ > >> > BaseX-Talk mailing list > >> > BaseX-Talk at mailman.uni-konstanz.de > >> > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > >> >