PDFreactor actually supports any kind of XML document natively, e.g. XHTML 1.0. If your documents are not XHTML (e.g. HTML 4.0), they are transparently loaded using a built-in automatic clean-up process.

To this regard, we recommend taking a look at the "Legacy HTML Code Sample" sample which is part of the PDFreactor sample package. This sample demonstrates how PDFreactor easily converts an HTML 4.0 document into PDF.