Call to undefined method SimpleXMLElement::getName() on PHP 5.1.2 or lower

After creating a new feed node I just get a blank page with the error:
Fatal error: Call to undefined method SimpleXMLElement::getName() in /var/www/vhosts/example.org/httpdocs/sites/all/modules/feedapi/parser_common_syndication/parser_common_syndication.module on line 226

Apparently the getName method only exists since PHP 5.1.3 (I'm using the Common Syndication Parser on PHP 5.1.2, and do have the SimpleXML extension installed). It's fine, as I was able to just use SimplePie instead, but if this implicit minimum PHP5 version is kept it would be nice to document it.