digraph charclass {

charClass -> charClassEsc;
charClass -> charClassExpr;

charClassExpr -> charGrp;
charGrp -> posCharGroup;
charGrp -> negCharGroup;
charGrp -> charClassSub;

posCharGroup -> charRange;
posCharGroup -> charClassEsc;

negCharGroup -> posCharGroup;

charClassSub -> posCharGroup;
charClassSub -> negCharGroup;
charClassSub -> charClassExpr;

charRange ->  seRange -> charOrEsc;
charRange ->  XmlCharRef;
charRange ->  XmlCharIncDash;

charOrEsc -> XmlChar;
charOrEsc -> SingleCharEsc;

charClassEsc -> SingleCharEsc;
charClassEsc -> MultiCharEsc;
charClassEsc -> catEsc;
charClassEsc -> complEsc; 

}