flex Expert System Toolkit - LPIS

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2. Frames and Inheritance 20 employee residence address city is 'London' In this example, the value attached to the residence attribute of the employee frame is a pointer to another frame, namely address. If we want to know the city of residence of an employee, we can refer to this in three different ways: X is the residence of employee and Y is the city of X or Y is the city of the residence of employee or, using the operator `s as shorthand Y is employee`s residence`s city all of which make London the value of the variable Y. For example, if we create a new employee instance called phil, then it will be assumed that phil lives in London. instance phil is an employee . If, however, Phil does not live in London, but in Glasgow, then we can reflect this with the following directive. do the city of residence of phil becomes 'Glasgow' This has actually set up the following structure. flex toolkit
2. Frames and Inheritance 21 employee residence address city is 'London' phil residence unique0 city is 'Glasgow' Global Variables One special use of frames is to store global variables. These are defined as attributes of a special frame called global. Example frame global default current_interest_rate is 10.3 . This creates a global variable called current_interest_rate which may then be referred to by any KSL statement. The values of global variables may be updated at run-time. Global variables are also used to store the response to a flex question - see the chapter on Questions. flex toolkit
Page 1: flex Reference By Dave Westwood
Page 4 and 5: The contents of this manual describ
Page 6 and 7: Contents 4 Contents Contents 4 1. I
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 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
Page 40 and 41: 3. Forward Chaining 38 First Come F
Page 42 and 43: 3. Forward Chaining 40 considered.
Page 44 and 45: 4. Data-Driven Programming 42 data-
Page 46 and 47: 4. Data-Driven Programming 44 Const
Page 48 and 49: 4. Data-Driven Programming 46 • c
Page 50 and 51: 4. Data-Driven Programming 48 conte
Page 52 and 53: 5. Questions And Answers 50 Rather
Page 54 and 55: 5. Questions And Answers 52 Customi
Page 56 and 57: 5. Questions And Answers 54 answer
Page 58 and 59: 6. Anatomy of a flex Program 56 ?-
Page 60 and 61: 6. Anatomy of a flex Program 58 fle
Page 62 and 63: 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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