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Microsoft Word Applied xml a toolkit for Programmers Wiley doc
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Bog'liq Ceponkus, Hoodbhoy - Applied XML - Toolkit for Programmers
Moreover, understanding the childNodes property is also necessary. The childNodes
property is a NodeList node that allows the programmer access to a node’s children. The
following script shows how a programmer would use the childNodes collection to gain
access to the root element and the children of the root element. Figure 5.2 shows what
the DOM exposes and can help follow the script below.
Figure 5.2:
DOM representation of above XML document.
There also exists an attributes property that points to a NamedNodeMap node, which is
used to hold a collection of Attribute nodes.
Everything Is a Node (Well, Almost Everything)
The chart in Figure 5.3 is not to be confused with Figures 4.13 through 4.19 (The Big
Picture). Figure 5.3 depicts the class inheritance. In other words, all classes that have a
parent (for example, node is the parent of Element) get all the properties and methods
that the parent class has. Figures 4.13 through 4.19, on the other hand, show how the
DOM exposes these various nodes. Note that in these figures, node is not found
anywhere. Node is used only to derive other classes and is not directly exposed.
Figure 5.3:
DOM Class hierarchy.
Node
Parent
: None
Almost all the nodes described in the
preceding chapter
are derived, either directly or
indirectly, from a base class called Node. The exceptions are the NodeList and
NamedNodeMap nodes, which don’t have a base class. A class that is derived from
another class (referred to as the base class) inherits all the methods and properties of the
base class. For example, the Node class defines the method childNodes, which every
class derived from Node can use without redefining childNodes. Even though most of the
nodes are derived from Node, a Node cannot exist on its own; only the specialized nodes
can be created.
A description of the properties and methods that are available to all classes (except
NodeList and NamedNodeMap) is presented in the following section.
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