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Q: 

heuristic(s) for detecting trackback links on a page

I'm writing my own blog (every one should do this once) and the project for this week is to automatically send (trackback || pingback) requests to pages to which I am linking. I'm writing in ruby, but would also like general heuristics. I would like some advice on the following:

1) What is the best way to pull RDF out of a document when it is hidden by comments. (Can LibXML/nokogiri do this?)

2) If there is not an RDF tag what are some other ways to find a trackback URL (e.g. xpath('//a[.="trackback"]')

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