DOCBOOK-APPS: How can I modify the default <entry> element?

[Giuseppe Greco <giuseppe.greco@fantastic.com>]

I would like to modify the default <entry> element.

For instance, I want just to specify that an <entry>
element with the property "role" set to "tablehead"
shuld be bold, and keep the rest of the properties as
defined by the default DSSSL stylesheet.

Thanks,

Giuseppe