[developers] How to unify a type constraint onto a dag extracted from chart (LKB)
berthold.crysmann at gmail.com
Tue Jun 25 23:13:19 CEST 2013
Dear fellow sea mammals,
I have a hook function that converts internal feature structure
representations of tone and length into diacritically marked surface
strings for generator output.
For some very good reason that is a bit hard to explain, I need to
synchronise tone and length lists in length at maximal words, in order
to enforce latent tonal constraints.
In the grammar, this is done by way of constraining dtrs in syntax rules
to have a SUPRA value of type supra_reent which
introduces the necessary reentrancies.
During unpacking such constraints are not enforced on the daughter
edges. That's why I need to unify this constraint in by way of the
function call. See code below.
However, although I can test that the new type is indeed supra_reent,
the associated constraints do not seem to get unified in. I.e. the lists
that this type equates are apparently not equated, as I can tell from
the underspecified list values. If I unify the supra_reent type into the
chart edge using the CLIM interface, list elements get xspecialised as
Here's the code that I have tried:
(get-dag-value (tdfs-indef (edge-dag daughter))
(create-typed-dag 'SUPRA_REENT) )
Thanks a lot in advance for your replies. I guess I am just calling the
wrong function, but which one to call instead?
Berthold Crysmann<crysmann at linguist.jussieu.fr>
CNRS, Laboratoire de linguistique formelle (UMR 7110), U Paris Diderot
Case 7031, 5 rue Thomas Mann, 75205 Paris cedex 13
Bureau 545, bâtiment Olympe de Gouges, rue Albert Einstein, 75013 Paris
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