XML Stack Overflow

I have this list property in a class and I need to decorate it with the correct xml attributes to get it in the form:

<Attachments>
    <Documents>
        <Document>
            the DocumentType nodes...
        </Document>
        <Document>
            the DocumentType nodes...
        </Document>
    </Documents>
</Attachments>

when I serialize the object. Here is the declaration of the list property within the class:

[XmlArrayItem("Documents", IsNullable = false)]
[XmlArrayItem("Document", IsNullable = false, NestingLevel = 1)]
public List<DocumentType> Attachments
{
    get
    {
        return this._attachments;
    }
    set
    {
        this._attachments = value;
    }
}

Currently what I get is this:

<Attachments>
    <Documents>
        the DocumentType nodes...
    </Documents>
    <Documents>
        the DocumentType nodes...
    </Documents>
</Attachments>

Its clear to me that the "Documents" node I want should be declared something other than an XmlArrayItemAttribute. The name of the list can not change. Help me Obi Wan Kenobi, you're my only hope.