It seems that XSweet conversion results in multiple
<h1> tags. Headings found inside of a
docx should be treated differently as the
HTML equivalent should only have a single
<h1> tag in order to be semantically correct as a standalone chapter. Also, that
<h1> should be first element in the doc as authors expect this text to be the title of the chapter.
All the rest of the headings inside a
docx should be converted into