tag balancer not handling non-xhtml ns element properly

In html, we have element <legend> in a none xhtml namespace. However, the tag balancer adds <fieldset> around the <legend> anyway. For example:
<legend xmlns="http://mynamespace"/> ends up like <fieldset><legend xmlns="http://mynamespace"/></fieldset>. This extra tag causing problem in the downstream process.

A suggestion on the fix is to modify getElement method in HTMLTagBalancer to add namespace checking code (between "begin change" and "end change") in the follow snippet.

protected HTMLElements.Element getElement(final QName elementName) {
String name = elementName.rawname;
if (fNamespaces && NamespaceBinder.XHTML_1_0_URI.equals(elementName.uri)) {
int index = name.indexOf(':');
if (index != -1) {
name = name.substring(index+1);
}
}
// ***** begin change ******
if (fNamespaces && elementName.uri != null && !NamespaceBinder.XHTML_1_0_URI.equals(elementName.uri))
return HTMLElements.NO_SUCH_ELEMENT;
//***** end change *******
return HTMLElements.getElement(name);
} // getElement(String):HTMLElements.Element