Explanation:
Type key # A single reference to a value in a typelist
Foreign key # A single reference to the ID of another entity
Field # Atomic data stored about the entity (non-restricted values)
Array key # A set of references to another entity
In the Guidewire Data Model, entities consist of different types of columns/properties that define their structure and relationships:
* Type key (B): This field creates a relationship between the entity and a Typelist (a pre-defined list of valid values, like a dropdown menu). For example, a Status field that can only be "Open", "Closed", or
"Pending" is a Type key pointing to the StatusType typelist. It references a single specific value from that list.
* Foreign key (D): This creates a link to a specific instance of another entity . It stores the unique ID of that related object. This represents a "Many-to-One" or "One-to-One" relationship. For example, a Claim entity has a Foreign Key to a Policy entity (because one claim belongs to one specific policy).
* Field (A): Often called a "Column" or "Atomic Field," this stores raw data such as Strings, Integers, Booleans, or Dates. It holds atomic data (e.g., "First Name", "Loss Date", "Coverage Amount") that is not restricted to a specific list of values like a Type key is.
* Array key (C): This represents a "One-to-Many" relationship. It allows the parent entity to link to a collection (set) of child entities. For example, a Policy entity has an Array of Vehicle entities (because one policy can cover multiple vehicles).
