# Functions
CreateClassifier creates a namespace classifier with registered creator func.
RegisterClassifier binds a classifier creator.
# Constants
DefaultNamespace is the namespace all the store and region belong to by default.
# Variables
DefaultClassifier is a classifier that classifies all regions and stores to DefaultNamespace.
# Interfaces
Classifier is used to determine the namespace which the store or region belongs.
# Type aliases
CreateClassifierFunc is for creating namespace classifier.