AncestorSequence(Environment env) 
{
            this.env = env;
}

 public Object exec(List names) throws TemplateModelException 
{
            if (names == null || names.isEmpty()) {
                return this;
            }
            AncestorSequence result = new AncestorSequence(env);
            for (int i=0; i< size(); i++) {
                TemplateNodeModel tnm = (TemplateNodeModel) get(i);
                String nodeName = tnm.getNodeName();
                String nsURI = tnm.getNodeNamespace();
                if (nsURI == null) {
                    if (names.contains(nodeName)) {
                        result.add(tnm);
                    }
                } else {
                    for (int j = 0; j< names.size(); j++) {
                        if (StringUtil.matchesName((String) names.get(j), nodeName, nsURI, env)) {
                            result.add(tnm);
                            break;
                        }
                    }
                }
            }
            return result;
}