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ITApplications XML Module

ITApplications XML Module. Session 8: Introduction to Programming with XML. Introduction – Programming with XML.

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ITApplications XML Module

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  1. ITApplications XML Module Session 8:Introduction to Programming with XML

  2. Introduction – Programming with XML • XML documents, when parsed, are represented as a hierarchical tree structure.This structure can be accessed by a programming tool via an API. SAX and DOM are two dramatically different APIs for accessing information in XML documents.

  3. Event-driven programming with Simple API for XML (SAX) • SAX was developed by the W3C and released in 1998. SAX-based parsers invoke methods when markup (e.g. a start tag, an end tag, etc.) is encountered. No tree structure is created - data is passed to the application from the XML document as it is found. SAX parsers are typically used for reading XML documents that will not be modified. • SAX-based parsers are available for a variety of programming languages; C++, Java, and Perl being the most popular. SAX is based on an event-driven model using call-backs to handle processing.

  4. What an event-driven program can do: • Search a document for an element containing a keyword • Print out formatted content • Modify an XML document by making small changes, such as fixing spelling and renaming elements • Read data to build a complex data structure • What an event-driven program can't do: • Re-order the elements in a document • Resolve cross-references between elements • Verify ID-IDREF links • Validate an XML document

  5. Event-driven programming with Document Object Model (DOM) • The W3C provides a standard recommendation for building a tree structure in memory for XML documents called the XML Document Object Model (DOM). A DOM-based parser exposes (i.e. makes available) a library, called the DOM Application Programming Interface (API), that allows data in an XML document to be accessed and modified by manipulating the nodes in a DOM tree.

  6. Event-driven programming with Asynchronous JavaScript and XML (Ajax) • Ajax is a web development technique that makes use of a combination of: • HTML/XHTML and stylesheets (CSS) for data presentation. • The DOM is programmed using Javascript for dynamically displaying data. • An XMLHttpRequest object is used to exchange XML data asynchronously between a browser and a web server.

  7. Concluding Remarks and Coursework Assignment • Let’s read the FMA assignment and clarify any questions you may have. • Any Final Questions???

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