Avoiding special characters in the XML output using JAXB

I am reading tweets and forming an XML out of it, for which I am using JAXB Marshaller and UTF-8 encoding. My problem is, the generated XML contains special characters like:

> x85, x93, xAQ

I found that these are UTF-8 encoded characters, but it makes my XML invalid.

Is there a way to avoid these characters in the generated XML.