What is a requirement for entities added to the domain graph in relation to foreign key relationships?

In the context of Guidewire and its domain graph, a fundamental principle is that any foreign key relationships established must logically connect to entities that are part of the same domain graph. This means that when creating or adding new entities within the graph, foreign keys should reference entities that are recognized and managed within that specific context.

When a foreign key links to an entity outside the domain graph, it can lead to inconsistencies and issues with data integrity, as the relationships between data points need to be fully understood and maintained within the scope of the graph. By ensuring that foreign keys relate to entities within the graph, it not only keeps the data structure organized but also enhances the ability to utilize Guidewire's capabilities effectively, such as queries and data manipulation.

This practice promotes a cohesive design where all entities work together seamlessly, allowing for accurate transactions and consistent data throughout the system. The integrity of the relationships defined by foreign keys is crucial for ensuring that data flows correctly and maintains its intended structure.