code: @Deprecated
      public static Marker getMarker(final String name, final String parent) {
          final Marker parentMarker = MARKERS.get(parent);
          if (parentMarker == null) {
              throw new IllegalArgumentException("Parent Marker " + parent + " has not been defined");
          }
          return getMarker(name, parentMarker);
      }
docs: Retrieves or creates a Marker with the specified parent. The parent must have been previously created.
  
  @param name The name of the Marker.
  @param parent The name of the parent Marker.
  @return The Marker with the specified name.
  @throws IllegalArgumentException if the parent Marker does not exist.
  @deprecated Use the Marker add or set methods to add parent Markers. Will be removed by final GA release.