code: func (extr *ContentExtractor) GetMetaContent(document *goquery.Document, metaName string) string {
  	content := ""
  	document.Find("meta").EachWithBreak(func(i int, s *goquery.Selection) bool {
  		attr, exists := s.Attr("name")
  		if exists && attr == metaName {
  			content, _ = s.Attr("content")
  			return false
  		}
  		attr, exists = s.Attr("itemprop")
  		if exists && attr == metaName {
  			content, _ = s.Attr("content")
  			return false
  		}
  		return true
  	})
  	return content
  }
docs: // GetMetaContent returns the content attribute of meta tag with the given property name