Create Object Types

To start with, we create some simple Object Types.

G.ObjectType bookType = new G.ObjectType('Book', 'Book__c')
    .addField('id', G.StringType, 'Id')
    .addField('name', G.StringType, 'Name');

Here we created an ObjectType of Book, bound to SObject type Book__c. The book type has two fields, id of String type and name of String type.