Method and system for providing multiple instances in a single multiple-instance object

• US 5,561,740 A
• Filed: 12/13/1994
• Issued: 10/01/1996
• Est. Priority Date: 12/13/1994
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Dingankar, Ajit T., Le, Tien N., Barrett, Kevin L.
• Primary Examiner(s): Downs, Robert W.
• Assistant Examiner(s): KATBAB, ABDOLLAH
• Application Number:
  US08/354,698
• Time in Patent Office: 658 Days
• Field of Search: 395/62, 395/700, 395/600
• US Class Current: 706/53
• CPC Class Codes: G06F 16/289 Object oriented databases

Abstract

A method and system for providing representation of multiple entities in a single multiple-instance object is disclosed and provides a powerful and economical way of representing objects in an object oriented knowledge based data processing system. A multiple-instance object contains slots and slot values which enable the access and modification of all entities represented by the multiple-instance object. The instance unique data, the context which defines an instance state, and the procedure to instantiate the multiple-instance object are all stored in the multiple-instance object. The processing or reasoning of the knowledge based system occurs as though objects exist for entities represented.

Claims

1. In a computer system operating under an object oriented environment, a method for providing a plurality of instances in a single object, comprising the steps of:

providing a slot for all instances having a common value within said single object;

providing a multiple-instance object (MIO) slot, within said single object, for each slot having a different value or different instances;

defining a different entity contact of a multiple-instance object by use of a multiple-instance object (MIO) key.

2. The method according to claim 1 wherein said multiple-instance object key describes a specific state to instantiate said object.

3. The method according to claim 2 wherein said MIO key references to another slot in said object.

4. The method according to claim 2 wherein said MIO key references to a slot in a different object.

5. The method according to claim 2 wherein said MIO key references to a method that returns said MIO key.

6. The method according to claim 1 further comprising the steps of:

assigning said MIO key to an index value;

representing said index value as a particular slot;

storing a unique value associated with an MIO slot as an indexed data structure.

7. The method according to claim 6, wherein said MIO key is indexed into an association list.

8. In a computer system operating in an object oriented environment, a method for accessing slots within a multiple-instance object, comprising the steps of:

determining whether an MIO demon function is attached to a referenced slot;

determining whether an MIO key facet on said referenced slot is set;

if said MIO key facet is set, obtaining said MIO key from said referenced slot MIO key facet;

if said MIO key facet is not set, obtaining said MIO key from an MIO key slot within a referenced object;

evaluating said MIO key;

obtaining an instance value by use of said MIO key to index into said referenced slot'"'"'s corresponding MIO slot;

placing said instance value in said referenced slot; and

returning said referenced slot value.

9. In a computer system operating in an object oriented environment, a method for modifying slots within a multiple-instance object, comprising the steps of:

determining whether an MIO demon function is attached to a referenced slot;

determining whether an MIO key facet is on said referenced slot;

if said MIO key facet is set, obtaining said MIO key from said referenced slot MIO key facet;

if said MIO key facet is not set, obtaining said MIO key from an MIO key slot within a referenced object;

evaluating said MIO key;

placing a new value into said referenced slot'"'"'s corresponding MIO slot by way of said MIO key as an index; and

placing said new value in said referenced slot.