function __construct($query, $request_type = 'issn', $sr_api_key = '')
{
$query_string = 'versions=all&' . $request_type . '=' . urlencode($query);
if ($sr_api_key) {
$query_string .= '&ak=' . $sr_api_key;
}
$client = new Zend_HTTP_Client();
$client->setUri('http://www.sherpa.ac.uk/romeo/api29.php?' . $query_string);
$response = $client->request();
if ($response->getStatus() == 200) {
$sr = $response->getBody();
$sr_xml = new DOMDocument();
$sr_xml->loadXML($sr);
$this->num_hits = $sr_xml->getElementsByTagName('numhits')->item(0)->nodeValue;
$this->issn = $sr_xml->getElementsByTagName('issn')->item(0)->nodeValue;
$this->jtitle = $sr_xml->getElementsByTagName('jtitle')->item(0)->nodeValue;
$pubs = $sr_xml->getElementsByTagName('publisher');
for ($i = 0; $i < $pubs->length; $i++) {
$id = $pubs->item($i)->getAttribute('id');
$name = $pubs->item($i)->getElementsByTagName('name')->item(0)->nodeValue;
$p = new Publisher($id, $name);
$p->setPrearchiving($pubs->item($i)->getElementsByTagName('prearchiving')->item(0)->nodeValue);
$p->setPostarchiving($pubs->item($i)->getElementsByTagName('postarchiving')->item(0)->nodeValue);
$p->setPdfarchiving($pubs->item($i)->getElementsByTagName('pdfarchiving')->item(0)->nodeValue);
$prerestrictions_xml = $pubs->item($i)->getElementsByTagName('prerestriction');
$prerestrictions = array();
for ($j = 0; $j < $prerestrictions_xml->length; $j++) {
$prerestrictions[] = strip_tags(trim($prerestrictions_xml->item($j)->nodeValue));
}
$p->setPrerestrictions($prerestrictions);
$postrestrictions_xml = $pubs->item($i)->getElementsByTagName('postrestriction');
$postrestrictions = array();
for ($j = 0; $j < $postrestrictions_xml->length; $j++) {
$postrestrictions[] = strip_tags(trim($postrestrictions_xml->item($j)->textContent));
}
$p->setPostrestrictions($postrestrictions);
$pdfrestrictions_xml = $pubs->item($i)->getElementsByTagName('pdfrestriction');
$pdfrestrictions = array();
for ($j = 0; $j < $pdfrestrictions_xml->length; $j++) {
$pdfrestrictions[] = strip_tags(trim($pdfrestrictions_xml->item($j)->nodeValue));
}
$p->setPdfrestrictions($pdfrestrictions);
$conditions_xml = $pubs->item($i)->getElementsByTagName('condition');
$conditions = array();
for ($j = 0; $j < $conditions_xml->length; $j++) {
$conditions[] = $conditions_xml->item($j)->nodeValue;
}
$p->setConditions($conditions);
$this->publishers[$id] = $p;
}
}
}