code: def extract_paragraphs(xml_string):
      
      assert isinstance(xml_string, str)
      xml_tree = ET.XML(xml_string.encode('utf-8'), parser=UTB())
      full_text = xml_tree.find('article:originalText', elsevier_ns)
      if full_text is None:
          logger.info('Could not find full text element article:originalText')
          return None
      article_body = _get_article_body(full_text)
      if article_body:
          return article_body
      raw_text = _get_raw_text(full_text)
      if raw_text:
          return [raw_text]
      return None
docs: Get paragraphs from the body of the given Elsevier xml.