This hierarchy allows a developer to navigate around the tree looking for specific information thus nodes are allowed to access. Xml tree structure xml documents are formed as element trees.
Dom is a way of describing those nodes and the relationships between them.
Xml dom tree. In an xml document the information is maintained in hierarchical structure. Understanding the dom is a must for anyone working with html or xml. Xml documents have a hierarchy of informational units called nodes.
An xml tree starts at a root element and branches from the root to child elements. When you want to extract the value of each element. A dom document is a collection of nodes or pieces of information organized in a hierarchy.
Dom parent. With dom functions we can create nodes remove nodes change their contents and traverse the node hierarchy. The tree structure is called a node tree.
Element nodes and text nodes are the two most common types of nodes. Each branch of the tree ends in a node and each node contains objects. All nodes can be accessed through the tree.
This hierarchical structure is referred to as the node tree. Traversing the node tree often you want to loop an xml document for example. All elements can have sub elements child elements.
In this chapter we will study about the xml dom node tree. The xml dom defines a standard way for accessing and manipulating xml documents. It presents an xml document as a tree structure.
The document object model dom is a cross platform and language independent interface that treats an xml or html document as a tree structure where in each node is an object representing a part of the document. The dom represents a document with a logical tree. Accessing nodes in the node tree via the relationship between nodes is often called navigating nodes.
The xml dom views an xml document as a tree structure. The array of elements with tag element using the method getelementsbytagname is obtained. This is called traversing the node tree.
Traversing means looping through or traveling across the node tree. This hierarchy allows a developer to navigate through the tree looking for specific information. Next we traverse through this array and display the child node values in a table.
Document object model dom is a standard tree structure where each node contains one of the components from an xml structure. The following image illustrates a part of the node tree and the relationship between nodes in books xml.