function setNamespace($ns) {
		if ($this->getNamespace() !== $ns) {
			$this->tag_ns[0] = $ns;
			$this->tag = $ns.':'.$this->tag_ns[1];
		}
	}
function setNamespace($ns) {
		if ($this->getNamespace() !== $ns) {
			$this->tag_ns[0] = $ns;
			$this->tag = $ns.':'.$this->tag_ns[1];
		}
	}
function setNamespace ( $ ns ) { if ( $ this -> getNamespace ( ) !== $ ns ) { $ this -> tag_ns [ 0 ] = $ ns ; $ this -> tag = $ ns . ':' . $ this -> tag_ns [ 1 ] ; } }
Set namespace of node
@param string $ns
@see getNamespace()
Set namespace of node