flex Expert System Toolkit - LPIS

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Contents 4 Contents Contents 4 1. Introduction 9 What is flex ? 9 What are expert systems? 9 Forward Chaining 10 Backward Chaining 10 Search 10 Frames and Inheritance 10 Questions and Answers 11 Explanations 11 Data-driven Programming 11 Knowledge Specification Language 11 2. Frames and Inheritance 12 What is a Frame ? 12 Linking Frames 15 Creating an Instance of a Frame 16 Overriding Inheritance 17 Attribute Chaining 19 Global Variables 21 Inheriting Values through the Frame Hierarchy 22 Depth-First versus Breadth-First Search ? 24 How Far Should the Search Go ? 25 Universal Defaults 26 Singular Versus Multiple Inheritance ? 26 Frame Relationships 26 3. Forward Chaining and Rules 29 Rules and Relations 31 Weighting of Rules 32 Attaching Explanations to Rules 33 The Forward Chaining Engine 33 A Simple Model 34 The Implemented Model 34 Ruleset 36 The Rule Agenda 37 Setting The Initial Rule Agenda 37 flex toolkit
Contents 5 Selecting Rules 37 Updating the Agenda 39 4. Data-Driven Programming 41 Data-Driven Procedures 41 Launches 42 Constraining the Values of Slots 44 Attaching Demons to Slot Updates 45 Restricting the Access to Slots 47 5. Questions and Answers 49 Defining Questions 49 Menu Selection 49 Storing Answers 50 Keyboard Input 51 Constrained Input 51 Customized Input 52 Default Questions 52 Explaining Questions 52 Invoking Questions 53 6. The Anatomy of a flex Program 55 A Simple flex Program 56 Extending the Program 58 flex and Prolog 59 Components of the KSL 59 7. The KSL 61 KSL Terms 61 KSL Objects 64 Arithmetic Expressions 68 Dereferencing 69 KSL Formulae 70 Conditions 70 Directives 73 KSL Control Structures 77 If-Then-Else 77 Repeat-Until Loops 77 While-Do Loops 78 For Loops 79 Extended For Loops 79 flex toolkit
Page 1: flex Reference By Dave Westwood
Page 4 and 5: The contents of this manual describ
Page 8 and 9: Contents 6 KSL Sentences 81 Frames
Page 10 and 11: Contents 8 Variant 196 Set 197 Gene
Page 12 and 13: 1. Introduction 10 Forward Chaining
Page 14 and 15: 2. Frames and Inheritance 12 2. Fra
Page 16 and 17: 2. Frames and Inheritance 14 Defaul
Page 18 and 19: 2. Frames and Inheritance 16 flex t
Page 20 and 21: 2. Frames and Inheritance 18 define
Page 22 and 23: 2. Frames and Inheritance 20 employ
Page 24 and 25: 2. Frames and Inheritance 22 Inheri
Page 26 and 27: 2. Frames and Inheritance 24 Depth-
Page 28 and 29: 2. Frames and Inheritance 26 Univer
Page 30 and 31: 2. Frames and Inheritance 28 The fl
Page 32 and 33: 3. Forward Chaining 30 the axioms a
Page 34 and 35: 3. Forward Chaining 32 flex toolkit
Page 36 and 37: 3. Forward Chaining 34 A Simple Mod
Page 38 and 39: 3. Forward Chaining 36 The basic cy
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5. Questions And Answers 54 answer
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6. Anatomy of a flex Program 56 ?-
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6. Anatomy of a flex Program 58 fle
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6. Anatomy of a flex Program 60 and
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7. Knowledge Specification Language
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8. Run-Time Interpretation of KSL 1
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9. Flex Predicates 120 9. flex Tool
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9. Flex Predicates 122 ask( +Name )
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9. Flex Predicates 124 flex toolkit
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9. Flex Predicates 126 every_instan
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9. Flex Predicates 128 forward_chai
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9. Flex Predicates 130 Examples fle
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9. Flex Predicates 132 are : Search
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9. Flex Predicates 134 isa_demon( ?
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9. Flex Predicates 136 Example ?- i
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9. Flex Predicates 142 new_group( +
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9. Flex Predicates 144 one of the f
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9. Flex Predicates 146 new_synonym(
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9. Flex Predicates 148 the agenda.
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9. Flex Predicates 150 Examples rem
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9. Flex Predicates 152 remove_quest
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9. Flex Predicates 154 spied_chain
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9. Flex Predicates 156 If the exist
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11. Example - Robbie Goes Shopping
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Appendix A - Examples 166 Appendix
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tail Appendix A - Examples 168 herb
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Appendix A - Examples 170 Represent
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Appendix A - Examples 172 The Ident
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Appendix A - Examples 174 Example 2
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Appendix A - Examples 176 The Rules
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Appendix A - Examples 178 group sta
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Appendix B - Formal Definition of K
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Appendix C - KSL Keyword Glossary 2
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Appendix D - Dealing with Uncertain
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Index 232 — GENERAL INDEX — —
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Index 234 cycle, 111 cycle/3, 106 c
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Index 236 attribute of, 51 child, 7
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Index 238 isa_exception/1, 117 isa_
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Index 240 Ordering, 58, 59, 88, 105
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Index 242 create, 128 disabling of,
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Index 244 Updating agenda, 29, 74 U
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Index 246 false, 180, 193 first, 72
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Index 248 —flex PREDICATES INDEX
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Index 250 run_data/0, 137 run_data/
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flex Expert System Toolkit - LPIS

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