private void setExpression(XmlAttributeNode attribute, XmlExpression xmlExpression) {
   attribute.setExpressions(new XmlExpression[] {xmlExpression});
 }
 protected void setExpressions(XmlAttributeNode attribute, List<XmlExpression> xmlExpressions) {
   attribute.setExpressions(xmlExpressions.toArray(new XmlExpression[xmlExpressions.size()]));
 }