XML - adding new line

In case it helps anyone, the following bit of c# code will create the multi-line XML structure

//Sets the text for a Word XML <w:t> node
//If the text is multi-line, it replaces the single <w:t> node for multiple nodes
//Resulting in multiple Word XML lines
private static void SetWordXmlNodeText(XmlDocument xmlDocument, XmlNode node, string newText)
{

    //Is the text a single line or multiple lines?>
    if (newText.Contains(System.Environment.NewLine))
    {
        //The new text is a multi-line string, split it to individual lines
        var lines = newText.Split("\n\r".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);


        //And add XML nodes for each line so that Word XML will accept the new lines
        var xmlBuilder = new StringBuilder();
        for (int count = 0; count < lines.Length; count++)
        {
            //Ensure the "w" prefix is set correctly, otherwise docFrag.InnerXml will fail with exception
            xmlBuilder.Append("<w:t xmlns:w=\"http://schemas.microsoft.com/office/word/2003/wordml\">");
            xmlBuilder.Append(lines[count]);
            xmlBuilder.Append("</w:t>");

            //Not the last line? add line break
            if (count != lines.Length - 1)
            {
                xmlBuilder.Append("<w:br xmlns:w=\"http://schemas.microsoft.com/office/word/2003/wordml\" />");
            }
        }

        //Create the XML fragment with the new multiline structure
        var docFrag = xmlDocument.CreateDocumentFragment();
        docFrag.InnerXml = xmlBuilder.ToString();
        node.ParentNode.AppendChild(docFrag);

        //Remove the single line child node that was originally holding the single line text, only required if there was a node there to start with
        node.ParentNode.RemoveChild(node);
    }
    else
    {
        //Text is not multi-line, let the existing node have the text
        node.InnerText = newText;
    }
}

The code above will create the necessary child nodes and carriage returns, and takes care of the prefix as well.

Use the <w:br/> tag.

I found it by creating a Word document, saving it as XML (via Save As), adding a forced line break with Shift Enter, and checked out the change. The essential difference seems to be just the w:br tag, apparently reflecting the HTML br tag.