Tutorial: Statements

When you’re finished defining the nouns and verbs for your app, as a next step you can write statements that connect these nouns via verbs. A statement is a sentence that is considered to be generally true in your app, and is therefore written in plural. In Hapsah, a Statement always has the structure of three parts:

Subject: noun representing the entity or descriptor that acts as the subject of the sentence.
Relationship: verb representing the connection between the subject and the object of the sentence.
Object: noun representing the descriptor or attribute that acts as the object of the sentence.

There are three kinds of statements you can write in order to:

Associate two entities: by connecting an entity as subject with another entity as object via an association relationship (e.g. Customers use Shopping carts).
Characterize an entity: by connecting an entity as subject with a descriptor or attribute as object via an attribution relationship (e.g. Grocery products are referred to by Product names).
Construct a descriptor: by connecting a descriptor as subject with an attribute as object via a consist of relationship (e.g. Addresses consist of Street names).

Example app: Grocery store

For our grocery store app we need the following statements.

Constructing Descriptors

Address

Addresses consist of Street names
Addresses consist of House numbers
Addresses consist of City names

Full name

Full names consist of First names
Full names consist of Surnames

Price

Prices consist of Currencies
Prices consist of Amounts

Characterizing Entities

Customer

Customers live at Addresses
Customers are referred to by Full names

Product

Grocery products are referred to by Product names
Grocery products are referred to by Product descriptions
Grocery products are valued at Prices

Shopping cart

Shopping carts total up to Prices
Shopping carts are reduced to Prices

Store

Grocery stores are located at Addresses

Associating Entities

Grocery stores offer Grocery products
Grocery stores offer Shopping carts
Customers use Shopping carts
Shopping carts contain Grocery products
Customers check out Shopping carts

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