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Answer Posted / csawant
Dom: (Tree-based)
This maps an XML document into an internal tree structure,
then allow an application to navigate that tree.
Tree-based APIs are useful for a wide range of
applications, but they normally put a great strain on
system resources, especially if the document is large.
Furthermore, many applications need to build their own
strongly typed data structures rather than using a generic
tree corresponding to an XML document. It is inefficient to
build a tree of parse nodes, only to map it onto a new data
structure and then discard the original.
SAX:(Event-based), SAX on the other hand, reports parsing
events (such as the start and end of elements) directly to
the application through callbacks, and does not usually
build an internal tree. The application implements handlers
to deal with the different events, much like handling
events in a graphical user interface.
In both of those cases, an event-based API provides a
simpler, lower-level access to an XML document: you can
parse documents much larger than your available system
memory, and you can construct your own data structures
using your callback event handlers.
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