public function registerNamespace($prefix, $uri)
    {
        $this->initializeXPath();
        $this->xpath->registerNamespace($prefix, $uri);
    }
public function registerNamespace($prefix, $uri)
    {
        $this->initializeXPath();
        $this->xpath->registerNamespace($prefix, $uri);
    }
public function registerNamespace ( $ prefix , $ uri ) { $ this -> initializeXPath ( ) ; $ this -> xpath -> registerNamespace ( $ prefix , $ uri ) ; }
Register a prefix and uri to the xpath namespace.

@param string $prefix The namespace prefix.
@param string $uri    The namespace uri.
Register a prefix and uri to the xpath namespace .