WeSearch_Rdf

Background

In WeSearch, we are exploring the use of semantic technologies, in particular RDF triple stores, to search potentially very lage collections of semantic annotations.

In the DELPH-IN context, there are three relevant types of semantic representations: (a) Minimal Recursion Semantics (MRS); (b) Elementary Dependency Structures (EDS); and (c) DELPH-IN MRS-Derived Bi-Lexical Dependencies (DM). Of these, MRS is arguably the most interesting, both in terms of completeness (EDS and DM are derived, simplified representations) and design choices in mapping MRS elements to RDF.

The DM format is part of the SemEval 2014 Task 8 on Broad-Coverage Semantic Dependency Parsing, where there is an exploratory search interface for DM graphs.

MRS in RDF

Following is an MRS example for the sentence Kim promised his manager to sing.. There are multiple exchange formats for MRS, and we use what is called the simple serialization (the format used in, among others, WikiWoods and DeepBank distribution, because of its premium balance of human and computer readability):

  [ LTOP: h1
    INDEX: e3 [ e SF: PROP TENSE: PAST MOOD: INDICATIVE PROG: - PERF: - ]
    RELS: < [ proper_q_rel<0:3>
              LBL: h4 ARG0: x6 [ x PERS: 3 NUM: SG IND: + ] RSTR: h5 BODY: h7 ]
            [ named_rel<0:3>
              LBL: h8 ARG0: x6 CARG: "Kim" ]
            [ "_promise_v_1_rel"<4:12>
              LBL: h2 ARG0: e3 ARG1: x6 ARG2: x10 [ x PERS: 3 NUM: SG IND: + ] ARG3: h9 ]
            [ def_explicit_q_rel<13:16>
              LBL: h11 ARG0: x10 RSTR: h13 BODY: h12 ]
            [ pronoun_q_rel<13:16>
              LBL: h17
              ARG0: x15 [ x PERS: 3 NUM: SG GEND: M PRONTYPE: STD_PRON ]
              RSTR: h18
              BODY: h19 ]
            [ pron_rel<13:16>
              LBL: h20
              ARG0: x15 ]
            [ poss_rel<13:16>
              LBL: h14 ARG0: e16 [ e SF: PROP TENSE: UNTENSED MOOD: INDICATIVE PROG: - PERF: - ] ARG1: x10 ARG2: x15 ]
            [ "_manager_n_1_rel"<17:25>
              LBL: h14 ARG0: x10 ]
            [ "_sing_v_1_rel"<29:34>
              LBL: h21 ARG0: e22 [ e SF: PROP-OR-QUES TENSE: UNTENSED MOOD: INDICATIVE PROG: - PERF: - ] ARG1: x6 ARG2: p23 ] >
    HCONS: < h1 qeq h2 h5 qeq h8 h9 qeq h21 h13 qeq h14 h18 qeq h20 > ]