links: 3-tuples -> 5-tuples?

Hi

I suggest to make an optional extension from 3-tuples to 5-tuples.
This enables content-to-content links in xml documents.

Sure for most applications a 3-tuple will be sufficient.
But these two optional parameters won't make the framework more complex.

current proposal: 3-tuples: type, source, target
extension:        5-tuples: type, source, target, source-path,
target-path

Markus

see also
http://plone.org/development/current/projects/ticle_folder/InitialProposal

--- EXAMPLE --------------------------------------------------

5-tuple
(type=ref,source=4711,target=4712,source-path=123,target-path=456)

source-document: zope-id 4711
_____________________________
| <document>                 |
| <header>My Title</header>  |
| .........................  |
| <link id="123">hi</link>   | -----------
| .........................  |            |
| </document>                |            |
|____________________________|            |
                                          |
target-document: zope-id 4712             |
______________________________________    |
| <document>                          |   |
| <header id="4562>My Title</header>  | <-
| .........................           |
| </document>                         |
|_____________________________________|


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