In the FSM framework, the state model definition, along with all the token processing logic, is provided in configuration files in XML format. In addition, lexicon and normalization files define logic used by the Master Index Standardization Engine to recognize and normalize specific values for each data type or variant. The standardization configuration files for the Master Index Standardization Engine must follow certain rules for formatting and interdependencies. The following topics provide an overview of the types of configuration files provided for standardization.