code: def parse_meta(content, meta_name, source_descr, content_attr_name="content"):
      
      dom = dhtmlparser.parseString(content)
  
      meta_tags = dom.find(
          "meta",
          fn=lambda x: x.params.get("name", "").lower() == meta_name.lower()
      )
  
      return [
          SourceString(tag.params[content_attr_name], source_descr)
          for tag in meta_tags
          if content_attr_name in tag.params
      ]
docs: Return list of strings parsed from `content` attribute from ``<meta>``
      tags with given `meta_name`.