public void* pop ()
Completes the process of a temporary sub-parser redirection.
This function exists to collect the user_data allocated by a matching call to
push. It must be called in the end_element handler corresponding to the
start_element handler during which push was called. You must not call
this function from the error callback -- the
user_data is provided directly to the callback in that case.
This function is not intended to be directly called by users interested in invoking subparsers. Instead, it is intended to be used by the subparsers themselves to implement a higher-level interface.
the user data passed to push