You say continuous stream, which suggests to me the XML is never finished and is thus always malformed, in the strictest interpretation.
If that's the case, you may need to either roll your own parse (no, not my first choice either) or write a pre-processer which sits in between the stream and the parsing module code which "trims off" the parts of the XML causing malformity, and feed the resulting subset XML to the parser, well-formed by its standards.
Okay, earlier I couldn't type, now I can't read. Going to get more coffee. Sheesh.