Renamed databind() to render() since databinding is not the only purpose of the method.

DomNodeExtensionBase super classes are now XML formatted by default.

DomeNodeExtensionsBase->verifyDataSource() now return false instead of throwing an exception - there is no way to return expected data while throwing an exception, so it now silently fails until I can come up with a better way of handling that.

Converted tag values into constants.

Converted repeated values in ListElementTest to

Completed the unit test for ListElement->verifyDataSource().