An XML processor takes an XML document and DTD file as input and processes them so that applications can access the information. There are two main API approaches for XML processors - SAX and DOM. SAX is an event-based approach where the processor signals events to the application as it recognizes syntactic structures. DOM builds a hierarchical tree of the document in memory that can then be randomly accessed by applications. SAX is faster but DOM allows random access and rearranging of the document.

1. XML PROCESSORS
AN XML PROCESSOR IS A NECESSARY PIECE OF THE
XML PUZZLE. THE XML PROCESSOR TAKES THE XML
DOCUMENT AND DTD AND PROCESSES THE
INFORMATION SO THAT IT MAY THEN BE USED BY
APPLICATIONS REQUESTING THE INFORMATION.

2. PURPOSE OF XML PROCESSORS
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3. NEED FOR API FOR XML PROCESSORS.

4. SAX APPROACH
• The simple API for XML(SAX) was released in may 1998 was
developed by XML user group ,XML-DEV
• It has been widely accepted as a de facto standard and is now
widely supported by xml processors
• This approach is called event processing.
• Whenever a syntactic structure of document is recognized the
processors signals an event to application by calling event handler.

5. DOM APPROACH
• Document object model(DOM) builds a hierarchical syntactic
structure of the document.
• The parser part of xml processors builds the DOM tree.
• Nodes of tree are represented as objects that can be accessed and
processed or modified by the application.
• After parsing the DOM representation is in memory and can be
accessed using tree traversals as well as random accesses.

6. ADVANTAGES OF SAX APPROACH
• SAX structure is not stored in memory
• Sax is faster than DOM approach.

7. ADVANTAGES OF DOM APPROACH
• If any part of document must be accessed more than once by the
application.
• If a application is required to do any rearrangement of document
, that can be done if whole document is accessible at the same
time.
• Accesses to random part of document are possible
• It avoids any processing of a document that is later found to be
invalid

8. THANK YOU
SAURAV MAWANDIA