Conditional statement in mdb.config

Hi all,

Is there a way to add a conditional statement in the mdb.config?

Something like this in plain english:

if 'category' is empty then use 'mdb-category' and if 'category' is not empty the use 'category'

<category>'category' not ""='category'</category>

<category>'category'=""='mdb-category'</category>

I know the 2 above lines are not in correct syntax, just to expain my idea.

Thanks.