void KoRdfSemanticItemViewSite::setProperty(const QString &prop, const QString &v)
{
    QString fqprop = "http://koffice.org/rdf/site#" + prop;
    KoDocumentRdf *rdf = d->m_semItem->documentRdf();
    Soprano::Model *m = rdf->model();
    Soprano::Node ls = linkingSubject();
    Soprano::Node pred = Node::createResourceNode(QUrl(fqprop));
    m->removeAllStatements(Statement(ls, pred, Node()));
    m->addStatement(ls, pred,Node::createLiteralNode(v), rdf->manifestRdfNode());
}
Soprano::Node KoRdfSemanticItemViewSite::linkingSubject() const
{
    KoDocumentRdf *rdf = d->m_semItem->documentRdf();
    Soprano::Model *m = rdf->model();
    Node pred(QUrl("http://koffice.org/rdf/site/package/common#idref"));
    Node obj = Node::createLiteralNode(d->m_xmlid);
    Node context = rdf->manifestRdfNode();
    // try to find it if it already exists
    StatementIterator it = m->listStatements(Node(), pred, obj, context);
    QList<Statement> allStatements = it.allElements();
    foreach (Soprano::Statement s, allStatements) {
        return s.subject();
    }
    Node ret = m->createBlankNode();
    m->addStatement(ret, pred, obj, context);
    return ret;
}