Which function extracts the HTML parameters while reading the feed?

I am not a wordpress expert. And I am trying to get working auto blogging plugins, I tried wp-o-matic and auto blog. I noticed the HTML from the feed specially parameters like class and id from the feed description are stripped down just plain tags. Like

<div class="someclass">
     some class
</div>

is stripped down to

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<div>
    some class
</div>

Which function of wordpress does this and how to prevent it from doing?

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