[developers] LOGON transfer rules filling in variable properties

[Emily M. Bender]

Thanks, Stephan!  I'd actually gotten as far as using the FLAGS.EQUAL
mechanism but ran into problems because I was trying to identify
variables across input and output.  I guess whatever +copy+ does
is what I was missing...

I'll give it a try,
Emily

On Wed, Mar 4, 2015 at 1:27 PM, Stephan Oepen <oe at ifi.uio.no> wrote:

> i had to look up some examples from the original LOGON Transfer Matrix
> (in SVN) myself, but it would seem that the FLAGS.EQUAL mechanism is
> supported for variable properties.  thus, something in the following
> spirit should work (and not cycle):
>
>   INPUT < [ ARG0 [ MOOD mood & #mood ] ] >,
>   OUTPUT < +copy+ & [ ARG0 [ MOOD realis ] ] >,
>   FLAGS.EQUALS < #mood >
>
> if, for some reason, the above refuses to cooperate, i dimly recall
> introducing ‘decorator’ EPs (e.g. ‘plural_noun_mark’ in the Transfer
> Matrix) to prevent cyclic rule applications: once the variable
> property is refined, one can put a mark on that variable, and
> somewhere towards the end of transfer all marks can be dropped ...
>
> good luck putting it all together!  oe
>
>
> On Wed, Mar 4, 2015 at 9:43 PM, Emily M. Bender <ebender at uw.edu> wrote:
> > Dear all,
> >
> > I'm reaching the end of this year's Ling 567, and this time around we
> have
> > two languages (Bardi [bcj] and Lithuanian [lit]) that contrast realis and
> > irrealis
> > mood, where irrealis is required in negated sentences but also possible
> > elsewhere (with other uses).
> >
> > We typically use VPM to set defaults for various variable properties to
> keep
> > the range of generator outputs down in our MT set up, but can't in this
> > case set MOOD to realis by default, since then we don't get any output
> > for negated sentences.
> >
> > It seemed tempting to try to create a family of transfer rules that
> > specialize
> > MOOD on the ARG0 of negated _v_rels (i.e. whose LBL is the LARG of a qeq
> > whose HARG is the ARG1 of neg_rel) to [ MOOD irrealis ] and that of
> > _v_rels that aren't negated to [ MOOD realis ].  The trouble is, I can't
> > figure
> > out a way to write this rule that doesn't feed itself.
> >
> > Is there something I'm missing, or (perhaps more likely) is this just
> not an
> > intended use case for the transfer rules/otherwise a bad idea in some
> way?
> >
> > Thanks,
> > Emily
> >
> > --
> > Emily M. Bender
> > Professor, Department of Linguistics
> > Check out CLMS on facebook! http://www.facebook.com/uwclma
> >
>



-- 
Emily M. Bender
Professor, Department of Linguistics
Check out CLMS on facebook! http://www.facebook.com/uwclma
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