code: def strip_xml_declaration(file_or_xml):
      
  
      xml_content = _xml_content_to_string(file_or_xml)
      if not isinstance(xml_content, string_types):
          return xml_content
  
      # For Python 2 compliance: replacement string must not specify unicode u''
      return _XML_DECLARATION_REGEX.sub(r'', xml_content, 1)
docs: Removes XML declaration line from file or string passed in.
      If file_or_xml is not a file or string, it is returned as is.