static FieldMapping()
{
_initializers = new Hashtable();
_initializers["const"] = typeof(ConstInitializer);
_initializers["fromField"] = typeof(FromFieldInitializer);
_initializers["from"] = typeof(FromFieldInitializer);
_initializers["newObject"] = typeof(NewObjectInitializer);
_initializers["new"] = typeof(NewObjectInitializer);
_initializers["guid"] = typeof(GuidInitializer);
_initializers["null"] = typeof(NullInitializer);
_initializers["custom"] = typeof(CustomInitializer);
_initializers["sequential"] = typeof(SequentialInitializer);
}