Choose from a list of options. question is a prompt displayed above the list. list is a list of option strings. Returns the pair [option_name, option_index].
Iterates through the header names in the header, passing capitalized header names to the code block.
Note that header names are capitalized systematically; capitalization may not match that used by the remote HTTP server in its response.
Check whether the object_id id is in the current buffer of objects to be pretty printed. Used to break cycles in chains of objects to be pretty printed.
Asks the user to answer question with an answer from the given list.
yields an instance of each installed XML writer
yields an instance of each installed parser
Return all reachable objects from root.