Help. Adding new skill.

[Compo]

Hi.
Is it possible to add a new "relevant" skill to the game, using only XML?

Ive managed to add the skill, and incorporate it with two core ones (social+intellectual), to make a average for the new skill.
However the game will not recognise this new skill. I want to add it to a item, as a minimum requirement, to make at a workbench. The game spits out errors saying cannot find skill def etc.

I just dont get it. Ive made a skilldef, browsed through the core files to find anything skill related, and added the new skills parameters etc, to my mods folder. Is it possible?

If it is..what core folder/XML's should i be looking at, to add a new relevant skill.

Thanks to anyone who can help