The section schema became part of the section

Starting from V7, the graphical section schema (ISectionSchema) becomes a child object of the section (IRestaurantSection). When the schema is changed, a general notification RestaurantSectionChanged will be generated. You can obtain the schema for the section, as before, using the method restaurantSection.TryGetSectionSchema(). The separate methods GetSectionSchemas, GetSectionSchemaById, etc. have been removed.

Previously, up to and including V6, the section schema was an independent entity with its own identifier, and there was no ability to track schema changes.