A UUID is one of those 128 bits strings used to uniquely and universally
identify something
that can be generated without the need for a central authority.
If you look inside a Windows Registry you'll find lots of them, because they're
used to
identify interfaces and objects by Microsoft OLE.
But I don't know if they can actually be of help to you...
http://en.wikipedia.org/wiki/UUID
http://java.sun.com/j2se/1.5.0/docs/api/java/util/UUID.html
Bye
Paolo Rizzi
________________________________
Da: [EMAIL PROTECTED] per conto di Sunburned Surveyor
Inviato: ven 16/11/2007 20.56
A: List for discussion of JPP development and use.
Oggetto: Re: [JPP-Devel] R: Question about persistent featureidentification...
Paolo,
What is a "UUID"?
I can always use a long value if an int value isn't big enough.
The Sunburned Surveyor
On Nov 16, 2007 9:52 AM, P.Rizzi Ag.Mobilità Ambiente
<[EMAIL PROTECTED]> wrote:
> If you want an automagically universal unique ID, you can use a UUID
> stored inside a suitable char field. You'll surely find some
> Java util to create it. It's not as small and performant as an integer,
> but it's guaranteed to be unique. A simple integer qith it's 2^31
> upper limit, may not be enough anyway...
>
> Bye
> Paolo Rizzi
>
>
> > -----Messaggio originale-----
> > Da: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] conto di
> > Sunburned Surveyor
> > Inviato: venerdì 16 novembre 2007 18.49
> > A: List for discussion of JPP development and use.
> > Oggetto: Re: [JPP-Devel] Question about persistent feature
> > identification...
> >
> >
> > I think we could do this using the ability to have an atttribute with
> > a datatype of Object. We could design an object that basically wraps
> > an integer and only allows its value to be modified with some type of
> > override method. I bet there is something like this in Apache's
> > Jakarta Commons, and it probably comes with a Generator class that
> > produces sequential IDs. I'll check it out.
> >
> > Thanks for the comments.
> >
> > The Sunburned Surveyor
> >
> > On Nov 16, 2007 7:46 AM, Andreas Schmitz <[EMAIL PROTECTED]> wrote:
> > > Sunburned Surveyor wrote:
> > >
> > > Hi,
> > >
> > > > Andreas wrote: "But I cannot really see
> > > > the point in trying to find a common name for an ID
> > field, as that usually
> > > > depends strongly on your use case"
> > > >
> > > > I didn't want a situation where a Feature Schema needs to have a
> > > > persistent ID attribute for my schema and another
> > persistent ID for
> > > > another plug-in. I thought if we could come up with a
> > fairly standard
> > > > persistent ID attribute name and datatype that other
> > plug-ins could
> > > > use it as well.
> > >
> > > I can see the benefit of an AttributeType for IDs,
> > preferably one that cannot be
> > > altered (or make it optional to enable modifications) by the user.
> > >
> > >
> > > Best regards, Andreas
> > > --
> > > l a t / l o n GmbH
> > > Aennchenstrasse 19 53177 Bonn, Germany
> > > phone ++49 +228 18496-11 fax ++49 +228 1849629
> > > http://www.lat-lon.de <http://www.lat-lon.de/>
> > > http://www.deegree.org <http://www.deegree.org/>
> > >
> > >
> > > -----BEGIN PGP SIGNATURE-----
> > > Version: GnuPG v1.4.6 (GNU/Linux)
> > >
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> > > Igkvl1nlMgj2Fj4w8NJ19rQ=
> > > =jRZM
> > > -----END PGP SIGNATURE-----
> > >
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