also take a look at polymodel:

http://code.google.com/appengine/docs/python/datastore/polymodelclass.html

On May 1, 12:54 pm, adelevie <[email protected]> wrote:
> try readinghttp://bret.appspot.com/entry/how-friendfeed-uses-mysql
>
> one pitfall to avoid is to rely on a recursive function to iterate
> through a tree.
>
> On May 1, 9:24 am, Ted <[email protected]> wrote:
>
> > > 1#
>
> > class Food(db.Model):
> >     category = db.StringListProperty()
> >     [other properties]
>
> > apple = Food(category=['fruit','red','iron','apple'])
> > greenfruit = Food(category=['fruit','green'])
> > veg3 = Food(category=
> > ['vegetable','category1','category2','category3'])
>
> > If you query category='fruit', you'll get both apple and greenfruit.
>
> > > 2#
>
> > Try to use auto-completion provided by some Ajax libraries like YUI.
>
> > > 3#
>
> > Do you mean XMPP and Jaiku, 
> > seehttp://morethanseven.net/2009/02/21/example-using-xmpp-app-engine-imi...
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