Prototype

User to user relationship:

Buyer to Seller: e.g., If Alice is a buyer, she can see the buying history order, and in history order she can find Bob who is a seller selling product. What's more, after searching product, Alice can go through the details of product item, and she can she the name of Bob. Click both name of Bob in history order and product details, website will go to the profile of Bob.

Seller to Buyer: e.g., As a seller, Bob can find the name of Alice who is one of the buyer of Bob's product on selling history order, after clicking the name of Alice, Bob can go through the profile of Alice.

User to domain relations

User to profile: e.g., Clicking on profile, should navigate to user profile page.

Buyer to buying history order: e.g., On profile page, click history order would navigate to the history order page.

Seller to selling history order: e.g., On profile page, click history order would navigate to the history order page.

Seller to wishing list: e.g., On profile page, click wishing list would navigate to the wishing list page. On wishing list page, user can see, add, remove, and update products on the list.

Seller to product: e.g. Seller can create product item, including title, description, price, location and etc.

Buyer to product: e.g. Buyer can search the product by key words, and navigate to product detail page; on the detail page of product, buyer can choose to buy the product and go the order page, or choose to add products to wishing list.