Question on Xesam capabilities

[Luca Dionisi]

Hi all,

Is it possible with the Xesam API to "search within results"
à la Google or even better?

I mean, will I be able, with a Xesam compliant search tool,
to do things like the following?

- search all files of type development (*.c; *.h; *.java; ...)

- within result set, search for  files containing some text
  e.g. "implements"

- within new result set, search for  files containing some
  other text, e.g. "get_width ("

- hilight the words that match the last search, and not
  the words used for previous filtering stages.

And could I expect fast results as for a classic query
with a indexed search engine?

TIA
--Luca