new proposed meta data mechanism in gephex-0.5

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Hi All,

seeing that the text-based meta data returned by the spec() and 
port_spec() functions
in gephex-0.5 (similar to gephex-0.4) suck, I recently created an 
alternative based
on a discussion with martin.
In
   [email protected]/gephex--georg-mac--0.5--patch-5

the meta data is returned as an in-memory tree structure, similar to a 
DOM tree
but simpler.

This has the advantage that additional meta-data can be more easily 
added
without worrying about the restricted format our structparser supports.

Another advantage is the creation of units by unittemplates. Instead of
messing around with creating a string spec, the spec can be simply 
created
by attaching subtrees to the spec-tree.

Georg
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