Question

as stated here the DOMConfiguration is not yet implemented. I need to normalize the namespaces, so that namespaces in child elements will be moved to the root element as long as prefixes are provided.

Is there any non-regexp way to do this?

Through, I am not sure, if this is even possible by DOMConfiguration but I was not even able to try it as you can see.

Maybe there is a way by setting up the libxml?

Thanks.

Answer 1

Well, as commented I have rewritten my code, to take care of namespaces on DOM build-up. This works as follows:

class Foo {

  const XMLNS = 'http://www.w3.org/2000/xmlns/';

  /**
   * Register a namespace with an optional prefix to the specified DOMElement.
   *
   * @param DOMElement $element
   * @param string $namespaceUri
   * @param string $prefix
   */
   public static final function registerNS(DOMElement $element, $namespaceUri, $prefix=null) {
     Preconditions::checkNotEmpty($namespaceUri);
     $name = "xmlns";
     if (!empty($prefix)) {
       $name .= ":$prefix";
     }
     $element->setAttributeNS(self::XMLNS, $name, $namespaceUri);
   }
}

Now, everytime (saying everytime here, to make things easier now) I add an element as a child of another element, I call this method and mostly provide the documentElement as the first parameter to add namespaces to the root element:

DOMDocument $doc = [...];
DOMElement $element = [...];
DOMElement $newChild = [...];
Foo::registerNS($doc->documentElement, $newChild->namespaceURI, $newChild->prefix);
$element->appendChild($newChild);