x = XmlObject.Factory.parse( "<bar><!---->abc</bar>" );
cFrom = navDoc( x, "tt" );
cTo = navDoc( x, "tttc" );
Assert.assertTrue( cFrom.removeXml() );
cFrom.insertChars( "[FROM]" );
cTo.insertChars( "[TO]" );
Assert.assertTrue( x.xmlText().equals( "<bar>[FROM]a[TO]bc</bar>" ) );