/**
* Removes a single Fragment from RDF Store by deleting all triples describing the Fragment URI
* WARNING: As far as triples extracted from the RDFa representation of a given fragment are concerned,
* this method only removes the following:
* 1) fragmentURI loomp:contains sommeURI .
* 2) all triples: someURI someProperty someOtherURI or someURI someProperty someLiteral
* If there are other triples further describing someOtherURI they will not be removed, becuase this
* requires the analysis of the entire RDF graph, i.e. the paths from someOtherURI to other fragmentURIs.
* At this point I do not have sufficient test data to play with. --> future work
*
* @param Fragment $fragment Fragment Object
*/
private function _removeFragment($fragment)
{
$it = $this->rdfModel->find(new Resource($fragment->getUri()), LOOMP::CONTAINS(), NULL)->getStatementIterator();
$this->_removeResWithAllProps($fragment->getUri());
// remove all triples describing a given resource which is not contained in any other fragment
while ($it->hasNext()) {
$s = $it->next();
$obj = $s->getObject();
if ($this->rdfModel->findCount(NULL, LOOMP::CONTAINS(), $obj) == 0) {
$this->_removeResWithAllProps($obj->getURI());
}
}
}
