code: protected final void registerDefaultMimeTypes( String... mimeTypes ) {
          assert !initialized : "No default MIME types can be registered after the sequencer has been initialized";
          if (mimeTypes != null && mimeTypes.length != 0 && acceptedMimeTypes.length == 0) {
              // There are no overridden mime types, so we can register the default MIME types ...
              if (acceptedMimeTypesSet == null) acceptedMimeTypesSet = new HashSet<String>();
              for (String mimeType : mimeTypes) {
                  if (mimeType == null) continue;
                  mimeType = mimeType.trim();
                  if (mimeType.length() == 0) continue;
                  acceptedMimeTypesSet.add(mimeType);
              }
          }
      }
docs: Set the MIME types that are accepted by default, if there are any. This method should be called from the
  {@link #initialize(NamespaceRegistry, NodeTypeManager)} method in the subclass.
  <p>
  This method can be called more than once to add additional mime types.
  </p>
  
  @param mimeTypes the array of MIME types that are accepted by this sequencer
  @see #isAccepted(String)