EuroMath WYSIWYG Editor serves as a XML editor with WYSIWYG capability. Basically, it transforms XML with XSLT into a FO tree (see FOP for details), which is then processed by FOP. It thus supports all output formats supported by FOP. It can be said that EuroMath displays, and is capable of editing, the PDF output (from that the semi-wysiwyg editing). Primarily it is intended to edit text documents, containing mathematical expressions, but it is capable of editing virtually any XML.