Explain about the getElementsByTagName and parseResults function in Ajax

Explain about the getElementsByTagName and parseResults function in Ajax
You use the tag method to retrieve all the property elements in the XML document as an array and assign the array to the local variable properties. Once you have the array of property elements you can iterate over each element in the array and retrieve the data. With parseResultsfunction you can get the next element in the array and assign it to the local property.