<div dir="ltr">Hi again,<div><br></div><div style>Some of my previous questions were answered in Saarland this year, but I have a few remaining regarding LTOP links:</div><div style><br></div><div style>(1) Why are both the pre- and post-slash content of LTOP links "NIL"?</div> <div style><br></div><div style>(2) Related to (1), how do we tell the difference between MRSs where:</div><div style> - the LTOP label is equated with some EP's label</div><div style> - the LTOP label (or hole, rather) is QEQed to some EP's label</div> <div style> - the LTOP label is neither a label nor a hole in the MRS*</div><div style><br></div><div style>* This last case might not be well-formed. It was briefly the case that Matrix grammars behaved this way, but they may have just been missing the appropriate QEQ.</div> <div style><br></div><div style>(3) Why bother with multiple LTOP links? Shouldn't there just be one pointing to the head of the set of nodes in a label-equality-set? The */EQ links in that set should cover the rest of the LTOP associations.</div> <div style><br></div><div style>Thanks in advance</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Mar 8, 2013 at 6:56 PM, Michael Wayne Goodman <span dir="ltr"><<a href="mailto:goodmami@u.washington.edu" target="_blank">goodmami@u.washington.edu</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi RMRS-list,<br> <br> I'm working on adding DMRS reading/writing support to my Python MRS<br> library. I've read through the Slacker Semantics paper and comments in<br> the Lisp code, but I have some remaining questions. Sorry this email<br> turned out quite long; even partial responses would be appreciated.<br> <br> * What does the paper mean by "head", as in Sec. 4.2 "Head selection<br> in the qeq graph". Is this like the heads of other dependency grammar<br> formalisms? It seems to, at least, be different from syntactic heads.<br> <br> * According to the lisp code, if an LTOP labels of a set of EPs, then<br> "the LTOP node in the DMRS is linked to each head predicate in that<br> set". This "LTOP node" is implicit, yes? I see its ID is 0, but I<br> don't see the node itself being output anywhere.<br> <br> * Regarding the LTOP link, should it be an undirected /EQ link? When I<br> try with the LKB, I see a link with no pre- nor post-slash content (or<br> rather, NIL):<br> <br> <link from='0' to='10004'><rargname>NIL</rargname><post>NIL</post></link><br> <br> * Furthermore, why is there textual content "NIL" rather than an empty<br> element <rargname/>? Would an empty element be interpreted the same?<br> As it is, this seems like it would break if, ${deity}-forbid, some<br> grammar developer defined a "NIL" role for EPs, such that "NIL" is<br> actually the rargname. E.g.:<br> [ "_example_n_1_rel" LBL: h3 ARG0:x4 NIL:h5 ]<br> <br> * Also related to LTOP links, when might we see the LTOP being linked<br> to more than one node? Admittedly I'm not very good at coming up with<br> examples, but I can't imagine such a sentence. Of course there's<br> things like "the dog barked loudly", where "loudly" and "barked" share<br> the label identified with LTOP, but in this case there would only be<br> one link going to the head of the label-equality-set: "loudly".<br> <br> * I'm also interested in DMRS-MRS conversion, and so I'd like to<br> recover the INDEX. I currently look for EPs that have no arguments<br> within their label-eq-set, and are not the argument of an EP outside<br> their label-eq-set. This by itself mostly works, except it can't<br> select between "bark" and "maybe" in "some dogs bark maybe". I can<br> exclude "maybe" if I look for EPs that don't have a hole argument<br> QEQing some other EP's label, but then I fail to select "and" in "some<br> dogs bark and sleep" (since L-HNDL and R-HNDL are hole arguments on<br> "and"). I could then refine this so it ignores EPs QEQing some other<br> EP only if the other EP's ARG0 isn't also an argument of the original<br> EP (e.g. "bark"'s label is QEQed from "and"'s L-HNDL, but its ARG0 is<br> also "and"'s L-INDEX), but now it feels like a hack. Is there a more<br> reliable way to do this, preferably without loading the grammar and/or<br> the SEM-I?<br> <br> Thank you,<br> <span class="HOEnZb"><font color="#888888"><br> --<br> -Michael Wayne Goodman<br> </font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br>-Michael Wayne Goodman </div>