TASK DEFINITION: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
PROBLEM: Sentence: 'Why does China demand apology from only Japan ?', Argument/Subject 1: 'japan', Argument/Subject 2: 'china'

SOLUTION: demand apology from

PROBLEM: Sentence: 'XHTML is a modified version of HTML that is fully XML compatible , so that it can be processed by XML parsers .', Argument/Subject 1: 'xhtml', Argument/Subject 2: 'html'

SOLUTION: be version of

PROBLEM: Sentence: 'Sign a petition of YAQU PACHA directed to NATO headquarter in Brussels , requesting to stop military operations or high efficiency sonar systems .', Argument/Subject 1: 'nato', Argument/Subject 2: 'brussels'

SOLUTION:
be headquarter in