Profiling: can I use a "complement"?

Hi,

can I profile for the complement of a profile value?

E.g. I would like to write something like:

<para os="linux">Some text.</para>
<para os="not linux">Other text.</para>

Instead of the harder to maintain:

<para os="linux">Some text.</para>
<para os="dos;hpux;hurd;solaris;win">Other text.</para>

Thanks for any advice!