ACTION: EricP to add xsd:boolean operators

   [PENDING] ACTION: EricP to propose text and tests to add {boolean <
   > = != boolean} to SPARQL [recorded in
   [49]http://www.w3.org/2006/05/09-dawg-minutes.html#action06]



I was trying to figure out how to propose diffs. I decided it was
easiest to commit and ask forgiveness. 
<http://www.w3.org/2001/sw/DataAccess/rq23/#chlog> 1.680 has the
changes to add operators for boolean = != < > <= >= . I looked and
xsd:boolean appears to be mentioned in all the appropriate lists and
tables (list of supported xsd types, and casting table.

title:
  boolean = boolean - true

data:
  http://www.w3.org/2001/sw/DataAccess/tests/data/Expr2/data-1.ttl

query:
  PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
  PREFIX : <http://example.org/ns#>
  SELECT ?a
   WHERE
       { ?a :p ?v .
         FILTER (?v = true) .
       }

result:
  <http://example.org/ns#x1>
  <http://example.org/ns#x2>
  <http://example.org/ns#x3>
  <http://example.org/ns#x4>


title:
  boolean < boolean - true

data:
  http://www.w3.org/2001/sw/DataAccess/tests/data/Expr2/data-1.ttl

query:
  PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
  PREFIX : <http://example.org/ns#>
  SELECT ?a
   WHERE
       { ?a :p ?v .
         FILTER (?v < true) .
       }

result:
  <http://example.org/ns#y1>
  <http://example.org/ns#y2>
  <http://example.org/ns#y3>
  <http://example.org/ns#y4>
-- 
-eric

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