@Override
public boolean eq(final ANode node) {
// no database node
if (!(node instanceof DBNode)) return false;
// ensure that the pre value is contained in the target documents
final DBNode db = (DBNode) node;
return data == db.data() && pres.contains(db.pre());
}
@Override
public Str item(final QueryContext qc, final InputInfo ii) throws QueryException {
ANode node, par = toNode(exprs[0], qc);
do {
node = par;
par = node.parent();
} while (par != null);
final DBNode dbn = toDBNode(node);
return dbn.kind() == Data.DOC ? Str.get(dbn.data().text(dbn.pre(), true)) : Str.ZERO;
}