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The only people that can give a definitive answer are the search engine creators themselves and they are not going to give away any secrets that may help the black hats. The best we can do is listen to best guesses of the number crunching statisticians.
In a Xara built site I just don't think they are worth the effort.
Statistics have shown that some weight is given to H1 tags although not much. You also may want to consider that creating H1 tags that are keyword rich but too much like the title and anchored heavily in the content may be seen as a bit spammy, and in fact not help at all.
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