text: Title: Texttiling and paragraphs
  Body: Hello. 
  
  I have a block of text that I want to segment. However I found out that the texttiling implementation requires that the input text is split into paragraphs. My questions is why does this happen? Doesn't the algorithm create pseudosentences and blocks on its own? After all, Hearst didn't rely on sentences and paragraphs to segment text.