ERG not generating *any* outputs for same MRS received from parsing

grammars ERG
1

I parsed the string the web that was not touched and got the following MRS:

[ TOP: h0
  INDEX: e2 [ e SF: prop ]
  RELS: < [ unknown<0:28> LBL: h1 ARG: x4 [ x PERS: 3 NUM: sg IND: + ] ARG0: e2 ]
          [ _the_q<0:3> LBL: h5 ARG0: x4 RSTR: h6 BODY: h7 ]
          [ _web_n_of<4:7> LBL: h8 ARG0: x4 ARG1: i9 ]
          [ neg<17:20> LBL: h8 ARG0: e10 [ e SF: prop TENSE: past MOOD: indicative PROG: - PERF: - ] ARG1: h11 ]
          [ _touch_v_1<21:28> LBL: h12 ARG0: e13 [ e SF: prop TENSE: past MOOD: indicative PROG: - PERF: - ] ARG1: i14 ARG2: x4 ] >
  HCONS: < h0 qeq h1 h6 qeq h8 h11 qeq h12 >
  ICONS: < e13 topic x4 > ]

I get no results back when using this for generation. This seems like a bug but maybe I’m missing something

2

You’re right that the failure to generate is due to a bug in the 2025 ERG (and earlier versions). The grammar includes a set of manually defined so-called trigger rules that cause semantically empty lexical entries such as relative pronouns to be introduced into the generator chart when the right conditions on the input MRS are met. These trigger rules failed to include one for negated relative clauses. This bug has been fixed, and the correction will be included in the next release of the grammar. If you want a patch in the meantime, the updated trigger rule file is available on request.