c - the difference between void (*xmlHashScanner) and void *xmlHashScanner -

what difference between void (*xmlhashscanner)(void *payload, void *data, xmlchar *name) , void *xmlhashscanner(void *payload, void *data, xmlchar *name) in c?
why behave differently?

xmlhashscanner user-defined function in library libxml2.
when try redefine function little different prototype: void *xmlhashscanner instead of void (*xmlhashscanner) have following error:

error: ‘xmlhashscanner’ redeclared different kind of symbol  void *xmlhashscanner(void *payload, void *data, xmlchar *name)        ^ in file included /usr/include/libxml2/libxml/parser.h:18:0,                  /home/solar/bureau/parser/src/diam_dict.c:12: /usr/include/libxml2/libxml/hash.h:88:16: note: previous declaration of ‘xmlhashscanner’ here  typedef void (*xmlhashscanner)(void *payload, void *data, xmlchar *name); 

i wonder difference between 2 of them.

void (*xmlhashscanner)(void *payload, void *data, xmlchar *name) 

declares xmlhashscanner pointer function returning void, whereas

void *xmlhashscanner(void *payload, void *data, xmlchar *name) 

declares xmlhashscanner function returning pointer void.

in both declaration , expression syntax, unary * operator has lower precedence postfix [] subscript , () function call operators, so

t *a[n];     // n-element array of pointer t t (*a)[n];   // pointer n-element array of t t *f();      // f function returning pointer t t (*f)();    // f pointer function returning t