code: private function startElement($parser, $name, array $attributes)
      {
          $this->metaStack->push($this->getPhpMeta($this->normalizeElementName($name), $attributes));
      }
docs: Handler for the parser that is called at the start of each XML element.
  
  @param resource $parser Reference to the XML parser calling the handler.
  @param string $name The name of the element.
  @param array $attributes Associative array of the element's attributes.