The Document Object Model (DOM) is an interface

specification maintained by the W3C DOM Workgroup that

defines an application independent mechanism to access,

parse, or update XML data. In simple terms it is a

hierarchical model that allows developers to manipulate XML

documents easily Any developer that has worked extensively

with XML should be able to discuss the concept and use of

DOM objects freely. Additionally, it is not unreasonable to

expect advanced candidates to thoroughly understand its

internal workings and be able to explain how DOM differs

from an event-based interface like SAX.