/usr/share/php/arc/serializers/ARC2_RDFXMLSerializer.php is in libarc-php 2.2.5-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* ARC2 RDF/XML Serializer
*
* @author Benjamin Nowack
* @license <http://arc.semsol.org/license>
* @homepage <http://arc.semsol.org/>
* @package ARC2
* @version 2010-11-16
*/
ARC2::inc('RDFSerializer');
class ARC2_RDFXMLSerializer extends ARC2_RDFSerializer {
function __construct($a, &$caller) {
parent::__construct($a, $caller);
}
function __init() {
parent::__init();
$this->content_header = 'application/rdf+xml';
$this->pp_containers = $this->v('serializer_prettyprint_containers', 0, $this->a);
$this->default_ns = $this->v('serializer_default_ns', '', $this->a);
$this->type_nodes = $this->v('serializer_type_nodes', 0, $this->a);
}
/* */
function getTerm($v, $type) {
if (!is_array($v)) {/* uri or bnode */
if (preg_match('/^\_\:(.*)$/', $v, $m)) {
return ' rdf:nodeID="' . $m[1] . '"';
}
if ($type == 's') {
return ' rdf:about="' . htmlspecialchars($v) . '"';
}
if ($type == 'p') {
$pn = $this->getPName($v);
return $pn ? $pn : 0;
}
if ($type == 'o') {
$v = $this->expandPName($v);
if (!preg_match('/^[a-z0-9]{2,}\:[^\s]+$/is', $v)) return $this->getTerm(array('value' => $v, 'type' => 'literal'), $type);
return ' rdf:resource="' . htmlspecialchars($v) . '"';
}
if ($type == 'datatype') {
$v = $this->expandPName($v);
return ' rdf:datatype="' . htmlspecialchars($v) . '"';
}
if ($type == 'lang') {
return ' xml:lang="' . htmlspecialchars($v) . '"';
}
}
if ($this->v('type', '', $v) != 'literal') {
return $this->getTerm($v['value'], 'o');
}
/* literal */
$dt = isset($v['datatype']) ? $v['datatype'] : '';
$lang = isset($v['lang']) ? $v['lang'] : '';
if ($dt == 'http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral') {
return ' rdf:parseType="Literal">' . $v['value'];
}
elseif ($dt) {
return $this->getTerm($dt, 'datatype') . '>' . htmlspecialchars($v['value']);
}
elseif ($lang) {
return $this->getTerm($lang, 'lang') . '>' . htmlspecialchars($v['value']);
}
return '>' . htmlspecialchars($this->v('value', '', $v));
}
function getPName($v, $connector = ':') {
if ($this->default_ns && (strpos($v, $this->default_ns) === 0)) {
$pname = substr($v, strlen($this->default_ns));
if (!preg_match('/\//', $pname)) return $pname;
}
return parent::getPName($v, $connector);
}
function getHead() {
$r = '';
$nl = "\n";
$r .= '<?xml version="1.0" encoding="UTF-8"?>';
$r .= $nl . '<rdf:RDF';
$first_ns = 1;
foreach ($this->used_ns as $v) {
$r .= $first_ns ? ' ' : $nl . ' ';
foreach ($this->ns as $prefix => $ns) {
if ($ns != $v) continue;
$r .= 'xmlns:' . $prefix . '="' .$v. '"';
break;
}
$first_ns = 0;
}
if ($this->default_ns) {
$r .= $first_ns ? ' ' : $nl . ' ';
$r .= 'xmlns="' . $this->default_ns . '"';
}
$r .= '>';
return $r;
}
function getFooter() {
$r = '';
$nl = "\n";
$r .= $nl . $nl . '</rdf:RDF>';
return $r;
}
function getSerializedIndex($index, $raw = 0) {
$r = '';
$nl = "\n";
foreach ($index as $raw_s => $ps) {
$r .= $r ? $nl . $nl : '';
$s = $this->getTerm($raw_s, 's');
$tag = 'rdf:Description';
list($tag, $ps) = $this->getNodeTag($ps);
$sub_ps = 0;
/* pretty containers */
if ($this->pp_containers && ($ctag = $this->getContainerTag($ps))) {
$tag = 'rdf:' . $ctag;
list($ps, $sub_ps) = $this->splitContainerEntries($ps);
}
$r .= ' <' . $tag . '' .$s . '>';
$first_p = 1;
foreach ($ps as $p => $os) {
if (!$os) continue;
$p = $this->getTerm($p, 'p');
if ($p) {
$r .= $nl . str_pad('', 4);
$first_o = 1;
if (!is_array($os)) {/* single literal o */
$os = array(array('value' => $os, 'type' => 'literal'));
}
foreach ($os as $o) {
$o = $this->getTerm($o, 'o');
$r .= $first_o ? '' : $nl . ' ';
$r .= '<' . $p;
$r .= $o;
$r .= preg_match('/\>/', $o) ? '</' . $p . '>' : '/>';
$first_o = 0;
}
$first_p = 0;
}
}
$r .= $r ? $nl . ' </' . $tag . '>' : '';
if ($sub_ps) $r .= $nl . $nl . $this->getSerializedIndex(array($raw_s => $sub_ps), 1);
}
if ($raw) {
return $r;
}
return $this->getHead() . $nl . $nl . $r . $this->getFooter();
}
function getNodeTag($ps) {
if (!$this->type_nodes) return array('rdf:Description', $ps);
$rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
$types = $this->v($rdf . 'type', array(), $ps);
if (!$types) return array('rdf:Description', $ps);
$type = array_shift($types);
$ps[$rdf . 'type'] = $types;
if (!is_array($type)) $type = array('value' => $type);
return array($this->getPName($type['value']), $ps);
}
/* */
function getContainerTag($ps) {
$rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
if (!isset($ps[$rdf . 'type'])) return '';
$types = $ps[$rdf . 'type'];
foreach ($types as $type) {
if (!in_array($type['value'], array($rdf . 'Bag', $rdf . 'Seq', $rdf . 'Alt'))) return '';
return str_replace($rdf, '', $type['value']);
}
}
function splitContainerEntries($ps) {
$rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
$items = array();
$rest = array();
foreach ($ps as $p => $os) {
$p_short = str_replace($rdf, '', $p);
if ($p_short === 'type') continue;
if (preg_match('/^\_([0-9]+)$/', $p_short, $m)) {
$items = array_merge($items, $os);
}
else {
$rest[$p] = $os;
}
}
if ($items) return array(array($rdf . 'li' => $items), $rest);
return array($rest, 0);
}
/* */
}
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