Exclude elements in transformation

Hi,

I want to exclude each element that is preceeded by a specific tag, call it
A.

So i have XML like:

<A>blah</A>
<B>blub</B>

I have a XSLT template for A and that includes the following element (B
here). So now i need a template for each element that is preceeded by A and
does nothing, but i don't know the Xpath expression or it.

Thx soenke.