1. 1. Introduction
   1. 1.1. Resource
2. 2. User Reference
   1. 2.1. nixops4 Command
   2. 2.2. Root Expression
   3. 2.3. Library
   4. 2.4. Module Options
   5. 2.5. Bundled Providers
      1. 2.5.1. Local Provider
         1. 2.5.1.1. file
         2. 2.5.1.2. exec
         3. 2.5.1.3. memo
         4. 2.5.1.4. state_file
3. 3. Provider Developer Reference
   1. 3.1. Resource Provider
      1. 3.1.1. Resource Provider Interface
      2. 3.1.2. Testing
   2. 3.2. nixops4-resource-runner Command
   3. 3.3. State
   4. 3.4. Protocols
      1. 3.4.1. Resource Protocol Schema
      2. 3.4.2. State File Schema
4. 4. Architecture
   1. 4.1. Components