Xapian discuss - Jan 2007 - Search for negation

Hi,

Is it possible to search a document that does not have a specific boolean?

For instance: NOT XA1

I'm sure it costs me more to have the engine search for 99 times XA2
... XA100 then it is to search for all fields that do not have XA1.

Thanks,

Maarten

On 27/01/07, M.J. van der Veen <forward@mvanderveen.nl>
wrote:
> Is it possible to search a document that does not have a specific boolean?
>
> For instance: NOT XA1
This is supported by SVN HEAD, but not by any released version.

Cheers,
    Olly

On Tue, Jan 30, 2007 at 03:31:50AM -0800, Rafael SDM Sierra
wrote:
> On 1/29/07, Olly Betts <olly@survex.com> wrote:
> >On 27/01/07, M.J. van der Veen <forward@mvanderveen.nl> wrote:
> >> Is it possible to search a document that does not have a specific
> >> boolean?
> >>
> >> For instance: NOT XA1
> >
> >This is supported by SVN HEAD, but not by any released version.
>
> Currently only the AND NOT operator is avaible right? (linux NOT windows)
I'm not quite sure what you're asking, so I'll try to be clearer!

"AND NOT" and "NOT" are synonyms (at least as of Xapian
0.9.3,
previously only "NOT" was understood).

Currently (i.e. in 0.9.9), this works:

    linux NOT windows

But this doesn't:

    NOT windows

In SVN HEAD, the latter also works (provided you enable it with the
appropriate flag).

Cheers,
    Olly