In schema definitions, what are getters and setters used for?

Getters and setters are crucial components in schema definitions as they provide a structured way to access and modify the values of fields within documents. Specifically, getters are methods that allow the retrieval of field values, while setters are methods that enable assigning new values to those fields. This encapsulation promotes better data management and integrity.

In practice, using getters and setters ensures that any logic related to retrieving or assigning values can be centralized within these methods. For instance, a setter might validate incoming data before assigning it, thus maintaining the integrity of the data stored within the document.

The other options do not accurately describe the role of getters and setters. Modifying database server settings, creating new documents, or enforcing security permissions pertain to different aspects of database management rather than the mechanisms for field value manipulation within a schema. Thus, option B succinctly captures the intended purpose of getters and setters in schema definitions.