1. Purpose: The article discusses the purpose of GPD - Core Design - Stone - Confluence, which is to provide information and guidelines for the core design of the GPD system.
2. User Scenarios: The article presents various user scenarios, including building, using, mapping, tagging, and analyzing data in the GPD system.
3. Core Domain Concept: The article introduces the core domain concept of the GPD system, including internal core concepts such as basic design principles and hotel code generation.