Figure 4.2: Conceptual model of a tree. - 103 - Figure 4.3

- 103 -
Figure 4.3:
Actual model of a tree using a NodeList.
NamedNodeMap.
This node is similar to NodeList, but possesses additional 
functionality for accessing child nodes using their name. This functionality is necessary 
for accessing attributes; as a result, NamedNodeMap nodes are used to hold attribute 
nodes.
Element.
The Element node type (see Figure 4.4) contains an element from an XML 
document. It has special facilities, which are described in 
Chapter 5
, for accessing and 
managing the attributes declared within the element. Element nodes are children of other 
element nodes, except for the topmost element node, which is a child of the document 
node. This topmost element node is referred to as the documentElement. The following 
XML document would have two Element nodes: root and someElement. The root 
Element node would be a child of the Document node, and the someElement Element 
node would be a child of the root Element node.
Figure 4.4:
Tree model of Element example.



Text.
Text nodes are used to represent the text that is contained within element tags 
(see Figure 4.6). The following XML document produces a Text node that is a child of the 
name Element node. This text node contains the value “Alex.”

- 104 -
Alex
Figure 4.6:
Tree model of Text example.
Attr (Attribute).
The Attr node type represents the attributes that are declared within the 
scope of an element (see Figure 4.7). Attribute nodes can also be children of nodes other 
than Element nodes, such as Entity and Notation nodes. The following XML document 
produces an Element node for root and an Attribute node for myAttribute. The 
myAttribute Attribute node is a child of the root Element node. A NamedNodeMap 
collection is used instead of the NodeList collection to hold attributes. Also, a Text node 
representing someValue is exposed.

Download 2,96 Mb.