Create a timeline based on multiple document types

Questions
1

I would love to make a list of timeline elements based on multiple document types:

Normal timeline elements (i.e. news - new and archived) and cases.

I am very, very new to Razor, and tried to write this:

@{
    // Get root node:
    var root = Model.AncestorOrSelf();
    // Get all descendants, filter by type:
    var nodes = root.Descendants("Timeline | Case");
    // Loop through the filtered nodes, displaying the properties:
    <ul>
    @foreach (var node in nodes)
    {
        <li>
            <h2>@node.pageTitle</h2>
        </li>
    }
    </ul>
}

Umbraco 4.8, .NET 4.0

Best regards
Kim

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/33822-create-a-timeline-based-on-multiple-document-types