this.validator = new XMLEditorValidator(xmlDocumentValidator,
document);
xmlDocumentValidator.validate(document);
this.asyncValidator = new AsynchronousXMLValidator(this.validator);
// Create the IAnnotationHover for this XMLEditor.
// This IAnnotationHover uses PolicyUtils.findProblemMarkers() with
// the line number to build up the hover text from the messages
// of all the problem markers for the specified line number.