There are two main approaches to start building an application service from scratch - data-driven and user-interface-driven a.k.a bottom-up and top-down. In this wizard we will follow the first approach.

Let's create a Data Structure, which will represent the entity Book.

The layout of the data structure is as follows:

`BOOKID INTEGER not null primaryKey
BOOKISBN CHAR 13 not null
BOOKTITLE VARCHAR 200 not null
BOOKAUTHOR VARCHAR 100 not null
BOOKEDITOR VARCHAR 100
BOOKPUBLISHER VARCHAR 100
BOOKFORMAT VARCHAR 100
BOOKPUBLICATIONDATE DATE
BOOKPRICE DOUBLE not null
`

The data model will be stored in a JSON format under the DataStructures folder of your project. After activation or publishing, the corresponding database table will be created

More information about how to manually create such a data structure, as well as the general concepts behind, can be found at: http://www.dirigible.io/samples/data_model.html and http://www.dirigible.io/help/data_structures.html