What type of identifiers are unique IDs and FIDs categorized as?

Unique IDs and FIDs (Feature IDs) are categorized as object identifiers because they serve the purpose of uniquely identifying individual records or features within a dataset. Object identifiers are essential in geographical information systems (GIS) as they allow each feature—such as a point, line, or polygon—to be distinctly recognized and accessed. This uniqueness is crucial when performing tasks such as spatial queries, analysis, and data management, ensuring that each feature can be individually manipulated without confusion from others in the database.

Global identifiers, on the other hand, generally refer to unique identifiers that can be recognized across different systems or datasets, which is not the primary function of unique IDs and FIDs. Security identifiers are typically used in the context of access control and permissions rather than tracking features within a GIS. Data identifiers can represent various types of identifiers but are not limited to the unique identification of objects within the same way that object identifiers are.