I was thinking about building a XWiki plugin that will import (dynamically) another website, either whole or partial (A little XML parsing of it), besides reading the one page Plugin Doc Is there any thing else that I could use to help me speed up this development? Like XML parser/HtmlTidy or something that XWiki may already uses?

While I am on this topic of html, since the Wiki will take Html/xml in the normal editing of the page. I would be willing to write a Validator that would strip out dangerious html (Cross site scripting,...) I have already done this in a filter for a "Sudo wiki" I was building from scratch, but would be willing to re-write it in a way that would be helpful to the project, if someone could point me in the right direction where this type of Class would fit in to the project.