XHTML provider doesn't handle some tags correctly

Tags such as <br/> aren't handled correctly by the XHTML parser.

John suggests the following:

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I did something like this on line 70 to fix:

String text = parser.getText();
// For simple tags like <BR/> we get START_TAG and END_TAG.
// Ignore END_TAG (otherwise it doubles the output).
if (!text.endsWith("/>")) {
buffer.append(text);
}
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