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.

Sentence: 'XHTML provides the framework for future extensions of HTML and aims to replace HTML in the future .', Argument/Subject 1: 'html', Argument/Subject 2: 'xhtml'
be replace by

Sentence: 'London is both the capital of England and the United Kingdom and it serves as the headquarters for the Royal Family .', Argument/Subject 1: 'london', Argument/Subject 2: 'england'
be capital of

Sentence: 'Paper presented at the annual meeting of the American Psychological Association , 1988 .', Argument/Subject 1: 'paper', Argument/Subject 2: 'american psychological association'

present at