[developers] (poosible) bug report: LKB doesn't generate on a different index

[Xuchen Yao]

Hello LKB developers,

I'm having a weird behavior of LKB that it generates selectively on MRX. 
I have two MRX representations with only 1 difference:  the first one 
uses "x5" as the ARG0 value of the main verb while the second one uses 
"x9". LKB generates from the first one but not from the second one.

To reproduce this, please do:

1. Save the two attachments as t1.xml and t2.xml

2. run the following cmd from LKB:

(lkb::generate-from-mrs (mrs::read-single-mrs-xml-file "/tmp/t1.xml"))
(lkb::generate-from-mrs (mrs::read-single-mrs-xml-file "/tmp/t2.xml"))

LKB should generate from one but not the other.

To illustrate more, the MRS in the two XML files look like this:

Sentence: a society is flooded greatly.

LTOP: h1
INDEX: e2
RELS: <
[ _A_Q_REL<0:1>
  LBL: h3
  ARG0: x5 [ x PERS: 3 NUM: SG ]
  RSTR: h13
  BODY: h12 ]
[ _society_n_of_rel<1:2>
  LBL: h14
  ARG0: x5 [ x PERS: 3 NUM: SG ]
  ARG1: i15 ]
[ _flood_v_cause_rel<3:4>
  LBL: h9
  ARG0: e2 [ e SF: PROP TENSE: PRES MOOD: INDICATIVE PROG: - PERF: - ]
  ARG1: p17
  ARG2: x5 [ x PERS: 3 NUM: SG ] ]
[ PARG_D_REL<3:4>
  LBL: h9
  ARG0: e18 [ e SF: PROP ]
  ARG1: e2 [ e SF: PROP PRES: UNTENSED MOOD: INDICATIVE PROG: - PERF: - ]
  ARG2: x5 [ x PERS: 3 NUM: SG ] ]
[ _great_a_1_rel<4:5>
  LBL: h9
  ARG0: e19 [ e SF: PROP TENSE: UNTENSED MOOD: INDICATIVE PROG: - PERF: - ]
  ARG1: e2 [ e SF: PROP PRES: UNTENSED MOOD: INDICATIVE PROG: - PERF: - ] ]
 >
HCONS: < h13 qeq h14 >

If you replae all "x5" with "x9" (or diff t1.xml t2.xml to show the 
difference) in the above MRS, you get the other one that doesn't generate.

The version of LKB I'm using:

LKB cvs-version: "$Date: 2009-04-27 07:23:53 -0700 (Mon, 27 Apr 2009) $" 
(downloaded directly from delph-in.net, so it's a binary format built 
with  Allegro CL) under Ubuntu 8.04, ERG (0902)

If this is a bug of LKB, could somebody please find out the mysterious 
reason? Or maybe LKB has some constraints on variable assignments while 
my program violated these constraints? Thanks.

With kind regards,

Xuchen Yao

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