HTML Code in Java String without Tags

I got some HTML in a String named content.

a simple HTML Code:

<table>
    <tr role="row">
       <td role="gridcell">Hello</td>
       <td role="gridcell">Another one</td>
    </tr>
    <tr role="row">
       <td role="gridcell">Second row</td>
       <td role="gridcell">Second column in second row</td>
    </tr>
</table>

Now I want to build a XML Document with Java.

I got some Methods to add tags, values and attributes:

private static Element appendNodeValAttr(Document doc, Node root, String tagName, String value, String... attrs)
    {
        Element e = doc.createElement(tagName);
        if (value != null) {
            e.appendChild(doc.createTextNode(value));
        }
        for(int i = 0; i < attrs.length; i+=2){
            e.setAttribute(attrs[i], attrs[i+1]);
        }
        root.appendChild(e);

        return e;
    }

for example:

appendNodeValAttr(doc, html, "font", "Some Text", "size", "30");

will return an Element with..

<font size="30">Some Text</font>

How can I change the String with all the tags, to Elements, which will be added finally to my document?

I really need some help.

Greetings.