/**
* Sets the namespace to use for rendering the ressource and
* checks if the passed namespace is valid for the requested
* ressource.
*
* @param string $namespace The namespace to set
* @return void
* @throws Faett_Channel_Exceptions_InvalidNamespaceException
* Is thrown if an invalid namespace was passed
*/
public function setNamespace($namespace)
{
// check if the namespace is valid
if (!in_array($namespace, $this->_getNamespaces())) {
throw Faett_Channel_Exceptions_InvalidNamespaceException::create('Invalid namespace ' . $namespace);
}
// initialize the namespace
$this->_namespace = 'http://pear.php.net/dtd/' . $namespace;
}
