@Override
    @Nullable
    public PrefixedName getQName() {
        final ASTNode[] nodes = getNode().getChildren(QNAME_FILTER);
        if (nodes.length == 1) {
            return new PrefixedNameImpl(nodes[0]);
        } else if (nodes.length == 2) {
            return new PrefixedNameImpl(nodes[0], nodes[1]);
        }
        return null;
    }
@Override
    @Nullable
    public PrefixedName getQName()