[Killaruna]

An example for an XML goal planner is pia\console\data\goals.xml
Have a look at the syntax and decide for yourself if it's flexible enough to fit your needs. Obviously you will have to make compromises, you can't get full generality and full flexibility together. A starting point would be to try to model your bot's behaviour using the suggested syntax... As for XML, I used it because it's a standardized data format with large support over all platforms. However, the key point is not using XML, but using a textfile-based scripting language in general.
The weapon specs you posted are indeed very similar to the ones I had in mind, the property-based system that is. I'm not yet sure though if it's discernibly better than a (far simpler) score system, which users might like to toy around with...