/**
* Initialize all internal structures to begin with some serialization.
* Returns true if initialization was successful (this means that the
* optional output file is writable).
* @param string $outfilename URL of the file that output should be written
* to, or empty string for writting to the standard output.
*
* @return boolean
*/
protected function prepareSerialization($outfilename = '')
{
$this->serializer->clear();
$this->element_queue = array();
$this->element_done = array();
if ($outfilename !== '') {
$this->outputfile = fopen($outfilename, 'w');
if (!$this->outputfile) {
// TODO Rather throw an exception here.
print "\nCannot open \"{$outfilename}\" for writing.\n";
return false;
}
}
return true;
}
public function clear()
{
parent::clear();
$this->namespaces_are_global = false;
$this->namespace_block_started = false;
}
public function clear()
{
parent::clear();
$this->sparql_namespaces = array();
}
