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"Alaric B. Snell" <alaric@alaric-snell.com> writes:
> On Wednesday 26 February 2003 16:28, Simon St.Laurent wrote:
> > alaric@alaric-snell.com (Alaric B. Snell) writes:
> > >It's not a DAG; you can't share subtrees. It's a tree!
> >
> > I share subtrees (chapters in DocBook) on a daily basis and even get
> > paid for it.
>
> Oh, you mean by having multiple references to the same entity? True, I'd not
> included that. And that tends to crop up in the implementation as duplication
> of the shared subtree; each node in the DOM can only have one parent, after
> all.
>
> > How exactly do you mean "you can't share subtrees"?
>
> Each node only having one parent.
>
> This is a valid DAG:
>
> A
> / \
> V V
> B C
> \ /
> V V
> D
>
> In XML, the best you can do is:
<!DOCTYPE A [
<!ATTLIST D id ID #IMPLIED>
<!ATTLIST D ref IDREF #IMPLIED>
]>
<A>
<B>
<D id="d1">
<any> children D might have, just to make it more interesting</any>
</D>
</B>
<C>
<D ref="d1"/>
</C>
</A>
Ari.
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