public function descriptionToExpData($desc, &$exact)
{
if ($desc instanceof SMWConjunction || $desc instanceof SMWDisjunction) {
$result = new SMWExpData(new SMWExpResource(''));
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('rdf', 'type'), new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Class')));
$elements = array();
foreach ($desc->getDescriptions() as $subdesc) {
$element = $this->descriptionToExpData($subdesc, $exact);
if ($element === false) {
$element = new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Thing'));
}
$elements[] = $element;
}
$prop = $desc instanceof SMWConjunction ? 'intersectionOf' : 'unionOf';
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('owl', $prop), SMWExpData::makeCollection($elements));
} elseif ($desc instanceof SMWClassDescription) {
if (count($desc->getCategories()) == 1) {
// single category
$result = new SMWExpData(SMWExporter::getResourceElement(end($desc->getCategories())));
} else {
// disjunction of categories
$result = new SMWExpData(new SMWExpResource(''));
$elements = array();
foreach ($desc->getCategories() as $cat) {
$elements[] = new SMWExpData(SMWExporter::getResourceElement($cat));
}
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('owl', 'unionOf'), SMWExpData::makeCollection($elements));
}
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('rdf', 'type'), new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Class')));
} elseif ($desc instanceof SMWConceptDescription) {
$result = new SMWExpData(SMWExporter::getResourceElement($desc->getConcept()));
} elseif ($desc instanceof SMWSomeProperty) {
$result = new SMWExpData(new SMWExpResource(''));
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('rdf', 'type'), new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Restriction')));
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('owl', 'onProperty'), new SMWExpData(SMWExporter::getResourceElement($desc->getProperty())));
$subdata = $this->descriptionToExpData($desc->getDescription(), $exact);
if ($desc->getDescription() instanceof SMWValueDescription && $desc->getDescription()->getComparator() == SMW_CMP_EQ) {
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('owl', 'hasValue'), $subdata);
} else {
if ($subdata === false) {
$owltype = SMWExporter::getOWLPropertyType($desc->getProperty()->getPropertyTypeID());
if ($owltype == 'ObjectProperty') {
$subdata = new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Thing'));
} elseif ($owltype == 'DatatypeProperty') {
$subdata = new SMWExpData(SMWExporter::getSpecialNsResource('rdfs', 'Literal'));
} else {
// no restrictions at all with annotation properties ...
return new SMWExpData(SMWExporter::getSpecialNsResource('owl', 'Thing'));
}
}
$result->addPropertyObjectValue(SMWExporter::getSpecialNsResource('owl', 'someValuesFrom'), $subdata);
}
} elseif ($desc instanceof SMWValueDescription) {
if ($desc->getComparator() == SMW_CMP_EQ) {
$result = SMWExporter::getDataItemExpElement($desc->getDataItem());
} else {
// alas, OWL cannot represent <= and >= ...
$exact = false;
$result = false;
}
} elseif ($desc instanceof SMWThingDescription) {
$result = false;
} else {
$result = false;
$exact = false;
}
return $result;
}
