flex Expert System Toolkit - LPIS

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7. Knowledge Specification Language 76 Database Maintenance Questions Database maintenance is accomplished by directives which add assertions to, or delete assertions from both the positive (facts) and the negative (exceptions) databases. Facts may be added and removed using the KSL keywords remember remember that forget forget that Examples remember that pregnant( P ) remember likes( alexander, harvey ) remember not raining forget danger_level( red ) forget that not boiling A very specific directive is the asking of a question, using the KSL keyword ask. ask Question Examples Procedure Calls ask starter ask password The questions starter and password will be defined elsewhere (using the question keyword). Finally, a directive can be a call to some procedure. It is the means by which directives (and thus rules and attached procedures) link into Prolog's backward chaining execution mode. flex toolkit
7. Knowledge Specification Language 77 KSL Control Structures The control structures in flex fall into two categories: conditional statements, and control loops. If-Then-Else Directives and conditions can be combined to form if-then-else statements. if-then-else statements test a given condition, and if the condition holds the directives indicated by then are performed, otherwise the directives indicated by else are performed. The basic format of an if-then-else loop is: if condition(s) then directive(s) else directive(s) end if There may be multiple conditions combined with and or or, and there may also be multiple directives combined with and. Examples action print_result ; do if the result of test is greater than 50 then write( 'You have passed' ) else write( 'You have failed' ) end if . action test_mileage ; do if the mileage of the car is greater than 20000 or the age of the car is greater than 2 then subtract 300 from the car`s value and add 20 to the car`s premium else add 30 to the car`s premium end if . Repeat-Until Loops A repeat-until loop repeats the given directive until a condition holds. The directive is performed before the test is made. flex toolkit
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flex Reference By Dave Westwood
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The contents of this manual describ
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Contents 4 Contents Contents 4 1. I
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Contents 6 KSL Sentences 81 Frames
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Contents 8 Variant 196 Set 197 Gene
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1. Introduction 10 Forward Chaining
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2. Frames and Inheritance 12 2. Fra
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2. Frames and Inheritance 14 Defaul
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2. Frames and Inheritance 16 flex t
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2. Frames and Inheritance 18 define
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2. Frames and Inheritance 20 employ
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2. Frames and Inheritance 22 Inheri
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2. Frames and Inheritance 24 Depth-
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Page 32 and 33: 3. Forward Chaining 30 the axioms a
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Page 38 and 39: 3. Forward Chaining 36 The basic cy
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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
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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 138 flex toolkit
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9. Flex Predicates 140 flex toolkit
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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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