code: private function buildMetaPaletteConditions($palette, $metaPalettes)
      {
          foreach ($metaPalettes as $typeName => $paletteInfo) {
              if ('default' === $typeName) {
                  continue;
              }
  
              if (preg_match('#^(\w+) extends (\w+)$#', $typeName, $matches)) {
                  $typeName = $matches[1];
              }
  
              foreach ($paletteInfo as $legendName => $properties) {
                  foreach ($properties as $propertyName) {
                      $condition = new AttributeByIdIsOfType($typeName, $this->connection, 'attr_id');
                      $legend    = $this->getLegend($legendName, $palette);
                      $property  = $this->getProperty($propertyName, $legend);
                      $this->addCondition($property, $condition);
                  }
              }
          }
      }
docs: Apply conditions for meta palettes of the certain render setting types.
  
  @param PaletteInterface $palette      The palette.
  @param array            $metaPalettes The meta palette information.
  
  @return void