public void testTagRoot() {
MappingDocument doc = new MappingDocument("UTF-16", false); //$NON-NLS-1$
MappingSourceNode source = new MappingSourceNode("source"); //$NON-NLS-1$
doc.addSourceNode(source);
MappingElement tagroot = new MappingElement("test"); //$NON-NLS-1$
source.addChildElement(tagroot);
assertTrue(doc.getRootNode() == source);
assertTrue(doc.getTagRootElement() == tagroot);
}