woody dynamic validation rule

[maisonneuve nico]

hi , i would make a account form with woody and store informations in a xml 
file (in fact in a XML database)
with this structure :
<user>
<id>0100007f664e8bad000000f69dd0d652</id>
<login>nicolas</login>
<password>cococo</password>
<name>maisonneuve</name>
<firstname>nicolas</firstname>
<role>user</role>
<email>[EMAIL PROTECTED]</email>
<entreprise>paris5</entreprise>
</user>

in the create action, at the end of the submit, i have to check if the login 
is already used or not.
i cant create a validation rule despit of the update action  (in update 
action, the login check will be always true and a validation error will be 
created)
so i make a avalon XMLDBcomponent with the hasResult(Xpath)
and update the file.js with this source code;
but how tell to the user the invalide login error (with validate rule it's 
easy but with this way i don't know how do)

or can we create a dynamic validatation rule

thank in advance

cocoon.load("resource://org/apache/cocoon/woody/flow/javascript/woody.js") ;
cocoon.load("flow/xmldb.js") ;
var display_pipeline = "account-display" ;
var sucess_pipeline = "account-sucess" ;
var collectionDB = "xmldb:xindice://localhost:8080/db/user" ;
var documentID;
var document;
var action;
function account(form) {

	action=cocoon.parameters["action"];

        if (action=="update") {
                //  bind the form with the document with the ID
                documentID=cocoon.parameters["documentID"];
                document = loadDocument(documentID,collectionDB);
        }
        // shows the form to the user until is validated successfully
   form.show(display_pipeline, formHandler);
        // bind the form's data back to the document
   form.save(document);
   // save the DOM-tree
        if (action=="update")
                updateDocument(document, documentID,collectionDB);
        if (action=="create")
                 addDocument(document, documentID,collectionDB)
	cocoon.sendPage(sucess_pipeline);

   form.finish();

}

function formHandler(form) {
   var model = form.getModel();
        if (verify(model))
                return true;
        else
                return false;
}

function verify(model) {

        // create a ID if the id is null
        if (model.id == null)
        {
                xmldb.setCollection(collectionDB);
                model.id=xmldb.generateID();
	}
	// init the user role  if it is null
	if (model.role ==null)
	{
		model.role="user";
	}
	if (action=="create")
	{
		var results=xmldb.hasResults("//user[login='"+model.login+"' and 
password='"+model.password+"'");
		return (!results);
	}
	else return true;
}

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