• Table of Contents
• Introduction
• Write a schema
• Uses for schemas in Oppia
• Configuration values
• Schema-based forms
• Validating controller arguments
• Schema validation system code
• How to write validation schemas for handlers
• Important code pointers
• Default and optional arguments
• Domain object arguments: Schemas with type object_dict
• Case 1: object_class key
• Case 2: validation_method key
• Extra validators
• Extra arguments
• Handlers with no arguments
• Post schema operations
• Common errors faced
• Examples for reference
• Debugging tricks
• Contact