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<?php
if (stripos($_SERVER['HTTP_ACCEPT'], 'text/turtle') !== FALSE) {
$schema = file_get_contents('ogp.me.ttl');
header("Content-Type: text/turtle");
die($schema);
} else if (stripos($_SERVER['HTTP_ACCEPT'], 'application/rdf+xml') !== FALSE) {
$schema = file_get_contents('ogp.me.rdf');
header("Content-Type: application/rdf+xml");
die($schema);
} else if ($_SERVER['HTTP_REFERER'] == 'http://ogp.me/') {
$schema = file_get_contents('ogp.me.ttl');
header("Content-Type: text/turtle");
die($schema);
}
header('Location: http://ogp.me/');
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