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PrediCalc: A Logical Spreadsheet Management System

Stanford Logic Group VLDB 2005 Demo. PrediCalc: A Logical Spreadsheet Management System. Michael Kassoff Lee-Ming Zen Ankit Garg Michael Genesereth August 30, 2005. Electronic Spreadsheets. Huge success

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PrediCalc: A Logical Spreadsheet Management System

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  1. Stanford Logic Group VLDB 2005 Demo PrediCalc: A Logical Spreadsheet Management System Michael Kassoff Lee-Ming Zen Ankit Garg Michael Genesereth August 30, 2005

  2. Electronic Spreadsheets • Huge success • Used by everyone from multinational conglomerates to individuals • Limitations • Functional definitions • Unidirectional update

  3. From Functions to Constraints Generalizing formulae to many-to-many constraints allows us to use spreadsheets for a wide variety of applications • Correct-on-capture data entry (smart forms) • “Start times must be before end times” • “The number of lap infants traveling must not be greater than the number of adults” • Enterprise Management policies • “Only senior managers can reserve the third floor conference room” • Design / Configuration • “Students must take at least 2 math courses to graduate”

  4. Logical Spreadsheets We choose to represent many-to-many relationships using logical formulae start-time(S) and end-time(E)  before(S,E) “The start time must be before the end time” event-owner(O) and senior-manager(O)  event-room(room301) “Only senior managers can reserve the third floor conference room” The focus is on symbolic data rather than numeric data

  5. Features of PrediCalc p(X)  q(X) • Distinguishes between user-specified cells and computed cells • Computed cells contain logical consequences of user-specified cells • Allows for simple retraction of value assignments • Propagation can occur in any direction • Constraints are not independent: p(X)  q(X) q(X)  r(X) p q a a p q b b User specified System generated p(X)  r(X)

  6. Inconsistency Tolerance • Uses a novel technique to handle inconsistency of values with constraints • Gives users feedback about violated constraints (I can’t explain this in 5 minutes… see the demo!)

  7. Thanks!

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