public function getSemantics($name, $majorVersion, $minorVersion) {
    $library = H5PDevelopment::libraryToString($name, $majorVersion, $minorVersion);
    if (isset($this->libraries[$library]) === FALSE) {
      return NULL;
    }
    return $this->getFileContents($this->filesPath . $this->libraries[$library]['path'] . '/semantics.json');
  }