What steps will reproduce the problem?
1. see test code below


What is the expected output? What do you see instead?
after setting the id with selenium.assignId("//form", "form1");
expected selenium.getAttribute("//form@id") to return the value of the id
instead get a selenium exception could not find attribute "//form@id"


Selenium version: 2.1.0 and 2.0.0
OS: Windows 7
Browser: Firefox
Brower version: 5.0

It works on google chrome 12

Minimal test below and attached uses Junit
---------------------------------------------------

package com.eviltester.bugs;

import static org.junit.Assert.assertEquals;

import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import com.thoughtworks.selenium.DefaultSelenium;
import com.thoughtworks.selenium.Selenium;

public class InvestigatePossibleAssignIDBug {

    private static Selenium selenium;

    // failed on *firefox  against 5.0
    // failed on *chrome
    // works on *googlechrome 12.0.742.122

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        selenium = new DefaultSelenium("localhost", 4444, 
                "*firefox", "http://compendiumdev.co.uk");
        selenium.start();
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
        selenium.close();
        selenium.stop();
    }

    @Before
    public void setUp() throws Exception {
        // this page has a simple form
        // the form does not have an id
        // some of the form elements have ids
        selenium.open("/selenium/basic_ajax.html");
    }


    @Test
    public void ruleOutRestOfTestCodeBySettingIDWithoutUsingAssignID(){
        assertEquals("could not get combo name using id","id",selenium.getAttribute("id=combo1@name"));

        //check that we can access the form attributes
        assertEquals("could not access form method","post", selenium.getAttribute("//form@method"));

        String result = selenium.getEval("window.document.forms[0].setAttribute('id','newformid');");

        assertEquals("could not get form id","newformid",selenium.getAttribute("//form@id"));       

    }

    @Test
    public void assignIDBug(){
        //check that we can get an attribute using an id
        assertEquals("could not get combo name using id","id",selenium.getAttribute("id=combo1@name"));

        //check that we can access the form attributes
        assertEquals("could not access form method","post", selenium.getAttribute("//form@method"));

        // have tried xpath=//form
        // have tried css=form
        selenium.assignId("//form", "form1");

        assertEquals("could not get form id","form1",selenium.getAttribute("//form@id"));       
    }   


}