These functions retrieve information on a SMIng class definition (SMIng).
smiGetClass(SmiModule*smiModulePtr,char*name) returns a pointer to structSmiClass that represents the
class with the given name in the given module(smiModulePtr ), or NULL if the class with the given name
does not exist.
smiGetFirstClass(SmiModule*smiModulePtr) and smiGetNextClass(SmiClass*smiClassPtr) are used to iterate
through the classes of the module given by smiModulePtr. They return a pointer to structSmiClass that
represents a class or NULL if there are no classes left in the module, or error has occurred.
smiGetClassModule(SmiClass*smiClassPtr) returns a pointer to structSmiModule, of the module containing
the given class.
smiGetParentClass(SmiClass*smiClassPtr) returns a pointer to structSmiClass pointing to the parent of
the given smiClassPtr, or NULL if the class is not derived.
smiIsClassScalar(SmiClass*smiClassPtr) returns int1 if the class is scalar(its unique statement
contains an empty list) or 0 otherwise. This method can be used in conjunction with
smiGetFirstUniqueAttribute() to determine whether the class is meant to be instantiated separately (has
unique statement with nonempty list), or if it is meant to be used as part of another class (has no
unique statement).