XML Parsing

All modern browsers have a build-in XML parser that can be used to read and manipulate XML. The parser reads XML into memory and converts it into an XML DOM object that can be accesses with JavaScript.
There are two basic types of XML parsers:
Tree-based parser: This parser transforms an XML document into a tree structure. It analyzes the whole document, and provides access to the tree elements
Event-based parser: Views an XML document as a series of events. When a specific event occurs, it calls a function to handle it
The document object model (DOM parser) is a tree-based parser.