xmlwriter_write_raw() not in 5.1.4 yet?

I'm on the latest and greatest PHP 5.1.4. I can see the function I think I want in the manual: http://us3.php.net/manual/en/function.xmlwriter-write-raw.php But the manual says it's only in CVS. I confirmed that I don't have it: * Fatal error: Call to undefined function xmlwriter_write_raw() in

     ***.php on line **

I am hoping that this function would let me merge already-created XML into the XML I am writing and avoid the <, >, &, etc escaping of content which is normally done when using xmlwriter_text(). Zend summary was talking about it back in December. We've had a couple version updates since then. Still not in the official release? * http://www.zend.com/zend/week/week268.php#Heading8 Anyone know the status of this function, if it does what I want, and what version I can start using it? Dante