Modifying topic classes and instances
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| − | Each topic may | + | Each topic may be related to zero or more class topics. Class-instance relation is used to express ''a type'' or ''a kind'' of a topic. Next image views traditional topic panel with a '''Schema type''' topic. Red circles mark topic's classes and instances. |
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| − | Also '''Topics > Add to topic > Add class''' menu selection adds topic a class and '''Topics > Delete from topic > Delete classes''' deletes the class | + | [[File:traditional_topic_panel_class_instances.gif|center]] |
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| + | Class is added to a topic by right clicking the title header '''Classes''' and selecting '''Add class'''. After selection, Wandora opens a pick-a-topic dialog used to address the topic class. Topic's class is deleted by selecting a row in the '''Classes''' table, right clicking the row, and selecting menu option '''Delete classes...'''. Multiple classes can be removed at once. Notice that deleting a class topic removes only class-instance relation. The topic itself is not removed. | ||
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| + | Also '''Topics > Add to topic > Add class''' menu selection adds topic a class and '''Topics > Delete from topic > Delete classes''' deletes the class. | ||
==Modifying topic instances== | ==Modifying topic instances== | ||
| − | Instance is added to a topic by right clicking the title header of Instances table and selecting '''Add instance...'''. Instance is deleted by selecting row in the instance table, right-clicking selected row and selecting '''Delete instances...'''. | + | Instance is added to a topic by right clicking the title header of '''Instances''' table and selecting '''Add instance...'''. Instance is deleted by selecting row in the instance table, right-clicking selected row and selecting '''Delete instances...'''. |
Also menu selections '''Topics > Add to topic > Add instance''' and '''Topics >Delete from topic > Delete instances''' can be used to add and delete instances. | Also menu selections '''Topics > Add to topic > Add instance''' and '''Topics >Delete from topic > Delete instances''' can be used to add and delete instances. | ||
Latest revision as of 16:54, 25 February 2013
Each topic may be related to zero or more class topics. Class-instance relation is used to express a type or a kind of a topic. Next image views traditional topic panel with a Schema type topic. Red circles mark topic's classes and instances.
Class is added to a topic by right clicking the title header Classes and selecting Add class. After selection, Wandora opens a pick-a-topic dialog used to address the topic class. Topic's class is deleted by selecting a row in the Classes table, right clicking the row, and selecting menu option Delete classes.... Multiple classes can be removed at once. Notice that deleting a class topic removes only class-instance relation. The topic itself is not removed.
Also Topics > Add to topic > Add class menu selection adds topic a class and Topics > Delete from topic > Delete classes deletes the class.
[edit] Modifying topic instances
Instance is added to a topic by right clicking the title header of Instances table and selecting Add instance.... Instance is deleted by selecting row in the instance table, right-clicking selected row and selecting Delete instances....
Also menu selections Topics > Add to topic > Add instance and Topics >Delete from topic > Delete instances can be used to add and delete instances.
[edit] Additional notes
Wandora models class-instance relations using internal data structures. Wandora doesn't contain a topic that represents the relation type or role types. This means that Wandora user can not use the relation class-instance nor role types class and instance in part of other relations. Wandora user can't set up a superclass of a class-instance, for example.
Wandora speaks of classes and instances while the Topic map standard speaks of types and instances. Reader should understand that a type described in Topic map standard is equivalent to a concept of a class in Wandora.
