LECTURE NOTES BY DR.B.RAMA DEVI

Click Here to Download Resolution Weak slot filler Structure Knowledge Representation Unification . Forward and backward Chaining Conceptual Dependency

 A Case Study: Design a Document Editor ¾     This chapter presents a case study in the design of a "What-You-See-Is-What-You-Get" (or "WYSIWYG") document editor called Lexi. ¾     We'll see how design patterns capture solutions to design problems in Lexi. ¾     A WYSIWYG representation of the document occupies the large rectangular area in the center. ¾     The document can mix text and graphics freely in a variety of formatting styles. ¾     Surrounding the document are the usual pull-down menus and scroll bars, and a collection of page icons for jumping to a particular page in the document.    Design Problems: Seven problems in Lexis's design: Document Structure: The choice of internal representation for the document affects nearly every aspect of Lexis's design.    All editing, formatting, displaying, and textual analysis will require traversing the represent...

Unit-1 Introduction 1.1What is a Design Pattern?      Designing reusable object-oriented software is  harder. ·       Must find relevant objects, factor them into classes at the right granularity, define class interfaces and inheritance hierarchies, and establish key relationships among them. ·       Design should be specific to the problem at hand but also general enough to address future problems and requirements. ·       Avoid redesign, or at least minimize it. ·       Expert designers reuse solutions that have worked for them in the past. ·       When they find a good solution, they use it again and again; consequently, you'll find recurring patterns of classes and communicating objects in many object-oriented systems. ·       These patterns solve specific desi...