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.

[Q]: 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'
[A]: be version of


[Q]: Sentence: 'The current President , Dr. Peter Fong , is the Head of the Centre for Executive Development of HKU SPACE and former Executive Vice President and Professor of Asia International Open University .', Argument/Subject 1: 'president', Argument/Subject 2: 'executive'
[A]: be head of


[Q]: Sentence: 'It 's also unclear whether original Conan star and current California governor Arnold Schwarzenegger will be involved .', Argument/Subject 1: 'schwarzenegger', Argument/Subject 2: 'californium'
[A]:
be governor of