java - How to define xml response in YUI autocomplete -

i using yui autocomplete xml datasource. working fine have small query.
how can filter suggestion field response xml. suppose xml response have following structure

<books>
<book>
<title> some_title </title>
<author> some_author </author>
</book>
</books>

how can configure output show <title> or <author> in auto suggestion list ?

thanks.

got yui forum
hope others :)