Amaya can display any well formed XML document and associate a CSS stylesheet with these documents.
For an XML document that refers to a not-supported DTD or namespace (different from XHTML, MathML and SVG), Amaya offers a limited support for the display and for the edition. Indeed, as Amaya doesn't analyse the associated DTD, it can't verify the validity of any XML document and can't get specific information about elements and attributes and about their organization within the document.