Video dialogue grammars by Karin Cavallin. 

Reconstructed in GF 2 with multiple inheritance. AR 16/9/2004

Example usage (test Swedish generation and parsing, and Prolog
generation)

  > i allSwe.gf
  > i allProlog.gf

  > gr -cat=DMove | l -tr -lang=allSwe | p -cat=DMove -lang=allSwe | l -lang=allProlog
  vill du använda svenska eller engelska
  ask ([language (X)])

The intended use of that grammar is in dialogue systems to program a
video recorder. Queries in Swedish are translated to Prolog.

The original grammar is written in GF 1.2 and includes. There is a
very nice modular structure, which could not be reproduced with the
single inheritance straightjacket of GF 2.0. But now we can finally
do this again!


Map of abstract syntax inheritances.

                all
              /     \
             /       \
     specUser         specSystem
    /        \       /          \
 genUser      specific        genSystem
  |         /  |    |  \          |
  |        /   |    |   \         |
  |       / channel time weekday  |
  |      |                        |
  |      |                        |
   -----general ------------------


The map was obtained by:

grep abstract *.gf */*.gf

all.gf:abstract all = specUser,specSystem **  {
Channel/channel.gf:abstract channel = {
Shared/general.gf:abstract general = {
Shared/specific.gf:abstract specific = general, weekday, time, channel ** {
System/genSystem.gf:abstract genSystem = general ** {
System/specSystem.gf:abstract specSystem = specific, genSystem ** {
Time/time.gf:abstract time = {
User/genUser.gf:abstract genUser = general ** {
User/specUser.gf:abstract specUser = specific, genUser ** {
Weekday/weekday.gf:abstract weekday = {