What come after map-class frame-relay is any alphanumberic character or numbers representing the frame-relay map name.
e.g
map-class frame-relay police-man-for-voice
means Police-man-for-voice is the name of my map class.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fwan_r/frcmds/wrffr4.htm#xtocid0