Description
bool 
fdf_get_ap ( resource fdf_document, string field, int face, string filename)
   The fdf_get_ap() function gets the
   appearance of a field (i.e. the value of the /AP key) and
   stores it in a file.  The possible values of face
   are FDFNormalAP, FDFRolloverAP and 
   FDFDownAP. The appearance is stored in 
   filename.