function parser(value) {
    const parser = new ParseDutch()
    add(parser.tokenizeParagraphPlugins, self.data('nlcstParagraphExtensions'))
    add(parser.tokenizeRootPlugins, self.data('nlcstRootExtensions'))
    add(parser.tokenizeSentencePlugins, self.data('nlcstSentenceExtensions'))
    return parser.parse(value)
  }
@param {string} value
  Document.
@returns {Root}
  Tree.