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Re: After XQuery, are we done?


trees graphs
Hunsberger, Peter wrote:

>Elliotte Harold <elharo@m...> 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? 
>>    
>>
over a hundred years of mathematical theory..... (i'm getting old - 
might be two hundred years)

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