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   RE: [xml-dev] After XQuery, are we done?

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Elliotte Harold <elharo@metalab.unc.edu> writes:
> Hunsberger, Peter wrote:
> > I don't get the distinction.  As soon as you've got a graph 
> you've got 
> > a tree (or perhaps many trees).
> > 
> Not necessarily. All trees are graphs but not all graphs are 
> trees. For 
> instance a pure tree can't represent a cycle but a graph can. 
> XML's rule 
> that a node can only have one parent is not a limit of graphs 
> in general.

Yes, I was trying to say that a tree is a subset of a graph, you snipped
the context:

> A more important question, which gets to the heart of the matter, is 
> who decides what is a graph, what is a tree, and by what 
> means do they 
> make the interpretation? 

Why do you care about having tree's if you've got a graph?


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