[xml] ampersand entity parsing error

[Brad Botkin <brad_botkin wgbh org>]

running xsltproc over xml such as:

<media:credit role="Studio Director &amp; Creative Producer">Joshua
Seftel</media:credit>

produces the error:

error : unterminated entity reference  Creative Producer

This doesn't happen with &lt; so is this just an oversight of the parser? Please
also reply to   brad_botkin wgbh org

Thanks in advance.
--Brad