This document discusses various aspects of enterprise application integration including cross-model linkage, a product meta model, a security model with roles and permissions, use cases for login and submitting payment information, nested requirements, a repository of actors, a release diagram, a system component diagram, and an animated activity diagram with a loop.

1. Enterprise Application Integration

2. Cross-Model Linkage

3. Product Meta Model

4. Security Model: Roles & Permissions

5. Use Case: Login

6. Use Case: Submit Payment Info

7. Nested Requirements

8. Repository of Actors

9. Release Diagram

10. System Component Diagram

11. Animated Activity Diagram with Loop