<!- A document with refrigerators --> < saleList> < refrigerators> < refrigerator type=¡± freezer on bottom¡± , price=¡± 210¡±/> < refrigerators> </ saleList> <!- A document with washers --> < saleList> < washers> < washer type=¡± front load¡± , price=¡± 145¡±/> < washer type=¡± top load¡± , price=¡± 130¡±/> </ washers> </ saleList>

All incoming XML documents are loaded into a MemorySystem object named usedList. You need to automate a process that will discover XML documents contain refrigerator elements. As soon as you ascertain that a document contains refrigerators, you can stop processing the document. You decide to use Visual studio . NET to develop an application that will contain a Boolean variable named hasRefrigerator. A value of True for this variable means that a document contains refrigerator elements. A value of false means that it does not. You want to ensure that the discovery process occurs as quickly as possible.