sortinfo in DMRS

[arademaker]

we should not produce a node that doesn't have any info besides its type...

http://wordnet.princeton.edu/pwn30/01000442-a-1#node-10005>
    <http://www.delph-in.net/schema/cfrom> 22 ;
    <http://www.delph-in.net/schema/cto> 25 ;
    <http://www.delph-in.net/schema/dmrs#hasId> 10005 ;
    <http://www.delph-in.net/schema/hasPredicate> <http://wordnet.princeton.edu/pwn30/01000442-a-1#predicate-10005> ;
    <http://www.delph-in.net/schema/hasSortInfo> <http://wordnet.princeton.edu/pwn30/01000442-a-1#sortinfo-10005> ;
    a <http://www.delph-in.net/schema/dmrs#Node> ;
    <http://www.w3.org/2000/01/rdf-schema#label> "_the_q<22,25>" .

...

<http://wordnet.princeton.edu/pwn30/01000442-a-1#sortinfo-10000>
    a <http://www.delph-in.net/schema/SortInfo> .

The quantifiers seem to not carry sortinfo information. See here

[yfaria]

In #34 I addressed the issue, but I just checked #21 and in a comment there is this XML-serialization:

<dmrs cfrom="-1" cto="-1" top="10003" index="10003">
  <node nodeid="10000" cfrom="0" cto="13">
    <gpred>udef_q</gpred>
    <sortinfo />
  </node>
  <node nodeid="10001" cfrom="0" cto="6">
    <realpred lemma="mask" pos="v" sense="1" />
    <sortinfo SF="prop" TENSE="untensed" MOOD="indicative" PROG="bool" PERF="-" cvarsort="e" />
  </node>
...  
 </dmrs>

So the "sortinfo" is still being outputted even though there is no information in it. If we want the RDF serialization to be as close as the XML one, I think we should let the code generate this node.

[arademaker]

Let us see what will be the comments in delph-in/docs#27

[arademaker]

OK, Michael presented some arguments for not changing the XML Schema, but I still believe that RDF needs different decision since it doesn't make sense to have a node without any property besides its type. Moreover. RDF validation and schema are complete different from XML. So this issue is about:

1. adaptation of the RDF Schema (vocabulary of DMRS)
2. adaption of the code to produce a sortinfo node only when we do have information to attach to this node.