Hey Liam, I really appreciate your time with this. That really clears everything up. Thanks again.- James
> Subject: Re: [basex-talk] Question regarding BaseX support for id and idref > From: l...@w3.org > To: james...@hotmail.com > CC: basex-talk@mailman.uni-konstanz.de > Date: Mon, 13 May 2013 23:53:54 -0400 > > On Mon, 2013-05-13 at 21:01 -0600, James Wright wrote: > > Liam, > > I think that answers my question and is what I expected. So basically > > BaseX and maybe XQuery as a whole does not respect or understand the > > id/idref concept formally and thus will not automatically join. > > It's actually not strictly true - a DTD-aware XQuery processor can > supply the id() and idref() XPath functions. However, these do not work > across documents, and the values must be legal XML identifiers. > > Having said that, most XML databases make indexes, so joins using FLWOR > and values will work based on values. > > Although there are no integrity constraints as such, you can use XML > Schema to validate incoming data in some implementations automatically, > and in others by running a validator as part of some external process. > > > [...] > > > I need to handle the relationship explicitly. > > Yes. > > Note also, by the way, that XML databases tend to go fastest when you > have > . few or zero XML namespaces > . lots of different XML element names > . content rather than attributes (as then you can use full text). > > But this is only a general rule of thumb; like all database query > languages you can sometimes write a query that takes milliseconds and > sometimes you write one that takes days. Luckily XQuery has been around > for a while and the surviving implementations generally do some pretty > good optimization. > > Liam > > -- > Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ > Pictures from old books: http://fromoldbooks.org/ > Ankh: irc.sorcery.net irc.gnome.org freenode/#xml >
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