Arrin Steenburgen

— You need to be comfortable with projects you have done in your past experience or during your internship. The interviewer will throw questions.

In this Wiki i would like to explain the various aspects of DOM and SAX parsing and their performance issues in a simple way that can help us in going much detail into Java Mapping.

Mapping is the way of transforming one XML structure to another XML Structure based on the business rules. As a part of it we do certain operations like breaking child nodes and attaching them to its parent node and more in an XML structure.

In XI/PI we have the following mapping techniques                 1. Graphical Mapping                 2. ABAP Mapping                 3. JAVA Mapping and                 4. XSLT Mapping.

Among all the above mapping techniques Java mappings improves the performance and is a preferred as they are executed on J2EE engine directly. But in case of graphical mapping XI/PI converts the mapping program into executable Java code internally based on graphical design and executes it on J2EE engine making it comparatively less efficiency. Java mappings are more useful when performance of integration server is a concern during runtime. Java mappings are parsing programs that can be developed in NWDS, import as .jar files and make use of in the mapping part of Integration Repository. NWDS provides suitable Java environment and higher level tools to parse XML documents through the Simple API for XML (SAX) and the Document Object Model (DOM) interfaces. The SAX and DOM parsers are standards that are implemented in several different languages. In the Java programming language, you can instantiate the parsers by using the Java API for XML Parsing (JAXP).Java mapping can be done in two ways            1. DOM Parsing             2. SAX Parsing

Parsing is a technique of reading and identifying XML tags from an XML document. DOM and SAX can either be a validating or a non validating parser.

A validating parser checks the XML file against the rules imposed by DTD or XML Schema, a non validating parser doesn't validate the XML file against a DTD or XML Schema. Both Validating and non validating parser check for the wellformedness of the XML document.

At the core of the DOM API are the Document and Node interfaces. A Document is a top level object that represents an XML document. The Document holds the data as a tree of Nodes, where a Node is a base type that can be an element, an attribute, or some other type of content. The Document also acts as a factory for new Nodes. Nodes represent a single piece of data in the tree, and provide all of the popular tree operations. You can query nodes for their parent, their siblings, or their children. You can also modify the document by adding or removing Nodes.

The Dom tree is composed of nodes and they are of 12 types:

SAX (Simple API for XML) is an event-driven model for processing the XML. SAX model is quite different from DOM, rather than building a complete representation of the document SAX parser fires off a series of events as it reads the document from beginning to end. Those events are passed to event handlers, which provide access to the contents of the document.   Event Handlers                 There are three classes of event handlers: DTD Handlers, for accessing the contents of XML Document-Type Definitions;

Error Handlers, for low-level access to parsing errors;

Document Handlers, by far the most often used, for accessing the contents of the document.

A SAX processor will pass the following events to a Document Handler:

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3. Click Protect Document, Protect Workbook or Protect Presentation
4. Click Add a Digital Signature
5. Read the Word, Excel, or PowerPoint message, and then click OK

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2. Verify Record Retention Timeframes
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• Extract the main archive to the desired install directory.
• Create an option file.
• Choose a MySQL server type.
• Initialize MySQL.
• Start the MySQL server.
• Secure the default user accounts.