Walking (drill)thru an XML with XmlReader

Given
//////////////sample XML
<a>
<aa></aa>
<ab> </ab>
<ac>
<aca></aca>
<acb></acb>
<acc> www <acca></acca></acc>
<accont q="q" >some content</accont>
</ac>
</a>

we want to validate XML for two custom conditions.
1. This XML cannot have Attributes.
2. Each node can contain either "childnodes" or content. Not both

Solution
Start with 3 classes
//Composite pattern as Datastructure.
public class anything
{
protected List<anything> children = null;
public bool HasContent;
}
public class Leafnode : anything
{
public string mytext { get; set; }
}

public class Nonleafnode : anything
{
public Nonleafnode()
{
children = new List<anything>();
}
public void AddChild(Nonleafnode ch)
{
children.Add(ch);
}
}


// recursor and pointers
private string filename = "c:\\myxml.xml";
XmlTextReader reader = null;
private bool ReadANode(XmlTextReader rr, Nonleafnode currentNode)
{
while (rr.Read())
{
string a = rr.Name;
string b =rr.Value;
if (rr.NodeType == XmlNodeType.Text)
{
currentNode.HasContent = true;
}
else if (rr.NodeType == XmlNodeType.EndElement)
{
return true;
}
else if (rr.NodeType == XmlNodeType.Element)
{
if ((!currentNode.HasContent) &&(!string.IsNullOrEmpty(rr.Value))) currentNode.HasContent = true;
else if (currentNode.HasContent) return false;
else if (rr.HasAttributes) return false;
else
{
bool mychildGood = true;
Nonleafnode child = new Nonleafnode();
currentNode.AddChild(child);
mychildGood = ReadANode(rr, child);
if (!mychildGood) return mychildGood;
}
}

}
return true;
}


// Caller
private void button1_Click(object sender, EventArgs e)
{
reader = new XmlTextReader(filename);
reader.WhitespaceHandling = WhitespaceHandling.None;
bool isCorrect = true;

Nonleafnode rootnode = new Nonleafnode();
isCorrect = ReadANode(reader, rootnode);

if (!isCorrect)
{
MessageBox.Show("Failed" + " Failed @ node " + reader.Name + reader.Value);
}
reader.Close();
}