In Open CSP you can add structured data to content pages by using class definitions. A class definition is a configuration for a specific type of page. For example you might have a "Person" class definition. On the class definition page you can configure that a person has parameters such as a first name, last name and date of birth. When a user creates a person page, they will have the option to fill these fields. You can also configure fields to be mandatory. The data is by default displayed in a sidebar on the right side of a page, but this layout can also be configured through the class definition.