nowrap

I'm trying to create an XHTML strict document and I have a table with a <td>
that I don't want to wrap.  However, attributes are not allowed by themselves in
XHTML without a value.  That is, you must write:

<td nowrap="nowrap">

instead of:

<td nowrap>

Neither of these are valid in XHTML.  Does anyone know what the CSS equivalent
should be?  (Does one exist???)

Thanks!
Peter