Validation of TLF-Markup with DTD?

Hi everyone,

we're using TLF to display structured text on the client side with Flex. The text comes from a database where it is stored in our own XML-Markup, transformed on the server side (java server) to TLF-Markup and then sent to the client.

Is there any possibility to make sure that the transformation on the server into TLF-XML results in a valid syntax so that the RichText component can display it? Something like a DTD for the TLF-Markup?

Thanks in advance!