PrF UG slots value type any

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The Any Value Type

Protege-Frames User's Guide
The Slots Tab
The Slot Browser
The Slot Buttons
The Slot Menu
The Slot Editor
The Value Type Menu
The Any Value Type
The Boolean Value Type
The Class Value Type
The Float Value Type
The Instance Value Type
The Integer Value Type
The String Value Type
The Symbol Value Type
Creating a New Slot
Viewing a Slot
Editing a Top-Level Slot
Overriding Slot Properties at a Class
Editing Slot Properties
Removing a Slot from a Class
Deleting a Slot from the Project
Adding a Slot to a Class
Removing Overrides From a Slot
Understanding Inverse Slots
Creating an Inverse Slot Relationship
Working with Subslots
Finding a Slot
The Slot Hierarchy Window
The Slot Icons
The Superslots Pane
Glossary, Editing Help

A value type of Any means the slot can take any one of the other values: Boolean, Class, Float, Instance, Integer, String, or Symbol. Any allows you to create a generic slot for a high-level class and then determine the actual value type at a lower level.

If a class inherits a slot of type Any, then the slot may be modified by restricting it to one of the other types. This is the only case where the actual value type of an inherited slot can be changed.

For example, suppose you are modeling a taxonomy for all the vertebrates in an ecosystem, with specific species as the instances. You could create the slot Diet at the Vertebrate class level. Then:

  • for the subclass Carnivore, you could restrict the Diet slot to type Instance, so that you could select specific species already in your taxonomy as the diet

  • for the subclass Herbivore, you could restrict the Diet slot to type Symbol and list possible food plants by name

A class that has a slot of type Any cannot have instances.

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