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Ideally, trackback should be integrated into XOOPS news module, so that each article has a trackback ID. Pingback should do the same, and provide a pingback url for each article.
If someone is working on this, please keep in mind to make your system have actual permalinks that won't become broken if a user needs to reinstall on the same or another server. There is a lot of research in the blogging world about how to do this the right way. Opinions on how it's done vary, but most bloggers agree that it is an important goal.
I would love to see XOOPS have a full-featured blogging module built for it, but that means finding out what most bloggers want and need in a blogging app. It's not necessarily the exact same things as in a CMS, but I don't think it's an impossible feat either.