In our seam application, it appears that if we ever have any content containing "? or '?, during rendering some sort of query string data will be appended at the point of the question mark. (For search engine purposes, I'll use text to explain that I'm referring to a double quote or single quote followed by a question mark.)
For example, if the .xhtml file contains:
Sorry. My subject was intended to be:
Using "? (double quote question mark) prepends query string data?