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DOM

Document Object Model

  1. Dangers of DOM

    by , 04-27-2012 at 06:13 PM
    At first glance, the DOM API seems to be more feature-rich, and therefore better, than the SAX API. However, DOM has serious efficiency problems that can hurt performance-sensitive applications.

    The current group of XML parsers that support DOM implement the in-memory object model by creating many tiny objects that represent DOM nodes containing either text or other DOM nodes. This sounds natural enough, but has negative performance implications. One of the most expensive operations ...
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    DOM
  2. Java DOM Schema Validation

    by , 04-27-2012 at 06:12 PM
    In Java it is possible to validate a DOM graph according to an XML Schema. The technique I will show here is validation after the DOM graph is created, not during creation as was otherwise the norm with DTD validation.
    First you must load the XML Schema into a Schema object. Once loaded into a Schema object you can use that same Schema object to validate multiple DOM graphs. This is smart, because then you only have to parse the XML Schema once. The result is significantly better performance, ...
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  3. DOM Element Attributes

    by , 04-27-2012 at 06:12 PM
    As you have already seen, you can access the attributes of an element via the Element interface. There are two ways to do so:
    Java Code:
    String attrValue = element.getAttribute("attrName");
    Attr attribute = element.getAttributeNode("attrName");
    Most of the time the getAttribute() method will do just fine.
    The Attr interface extends Node. It allows you to access the owning element via the methodgetOwnerElement() etc. Accessing an attribute via ...
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  4. DOM Elements, Child Elements, and the Node Interface

    by , 04-27-2012 at 06:11 PM
    The root element has children which can be elements, comments, processing instructions, characters etc. You get the children of an element like this:
    Java Code:
    NodeList nodes = element.getChildNodes();
    
    for(int i=0; i<nodes.getLength(); i++){
      Node node = nodes.item(i);
    
      if(node instanceof Element){
        //a child element to process
        Element child = (Element) node;
        String attribute = child.getAttribute("width");
    ...
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  5. Creating DOM Child Elements

    by , 04-27-2012 at 06:10 PM
    This lesson shows you how to create root and child elements in the DOM tree. We will first create a blank DOM document and add the root element to it. Then I show you how to add comment element and then child element to the root element. In this example following xml code will generated and displayed on the console.
    XML Code:
    <?xml version="1.0" encoding="UTF-8" ?> 
    <root>
    <!-- This is comment--> 
    <Child attribute1="The value
    ...
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    DOM
  6. Creating Blank DOM Document

    by , 04-27-2012 at 06:09 PM
    This tutorial shows you how to create blank DOM document. JAXP (Java API for XML Processing) is a Java interface that provides a standard approach to Parsing XML documents. With JAXP, we will use the Document BuilderFactory to create DocumentBuilder class.
    The class DocumentBuilderFactory is responsible for creating new DOM parsers. Normally it is used to a DOM parser. Example is as follows:
    Java Code:
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
     DocumentBuilder
    ...
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    DOM
  7. What is DOM?

    by , 04-27-2012 at 06:08 PM
    Document Object Model: DOM is a platform- and language-neutral interface, that provides a standard model of how the objects in an XML object are put together, and a standard interface for accessing and manipulating these objects and their inter-relationships.

    The DOM is an interface that exposes an XML document as a tree structure comprised of nodes. The DOM allows you to programmatically navigate the tree and add, change and delete any of its elements.

    The DOM programming ...
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  8. The Benefits of JAXP

    by , 11-29-2011 at 02:58 AM
    One of the most important technologies available in java is the APIs used to work with XML. There are basically two ways to work with XML documents. SAX involves an event driven means of processing XML using callbacks to handle the relevant events. DOM involves using an in-house tree structure of the XML document. Sun Microsystems created a Java API for XML Processing (JAXP) toolkit which makes XML manageable for all developers to use. It is a key component for exploiting all the possibilities with ...

    Updated 11-30-2011 at 03:01 PM by Java XML

    Categories
    JAXP , DOM , SAX.