private static void AddAnnotationWithMerge(MetadataItem metadataItem, IndexAnnotation newAnnotation)
{
var existingAnnotation = metadataItem.Annotations.GetAnnotation(XmlConstants.IndexAnnotationWithPrefix);
if (existingAnnotation != null)
{
newAnnotation = (IndexAnnotation)((IndexAnnotation)existingAnnotation).MergeWith(newAnnotation);
}
metadataItem.AddAnnotation(XmlConstants.IndexAnnotationWithPrefix, newAnnotation);
}