Dear XWiki Community

I am completely new to XWiki but so far I think, it could be a ideal starting point for
realizing a personal documentation system.

However, I would need to extend XWiki for new custom tags which would allow me
structuring my contents in a special way.

Can this easily be done with XWiki? Are plugins the "way to go"? Can limitations
for XWiki's extensibility already be pointed out?

Thanks a lot!
ma/esch