Accessing node data

An XML document can be read by accessing the elements of its node tree using the appropriate PBDOM_OBJECT subclasses and methods. The following code uses an array, the PBDOM_OBJECT, and its descendant class PBDOM_DOCUMENT, and the GetContent and GetRootElement methods of the PBDOM_DOCUMENT class to access node data on an XML document.

A PBDOM_DOCUMENT object named pbdom_doc contains the following XML document:

<Root>
    <Element_1>
        <Element_1_1/>
        <Element_1_2/>
        <Element_1_3/>
    </Element_1>
    <Element_2/>
    <Element_3/>
</Root>

The following code declares an array to hold the elements returned from the GetContent method, which reads the PBDOM_DOCUMENT object named pbdom_doc:

PBDOM_OBJECT pbdom_obj_array[]
...
pbdom_doc.GetContent(ref pbdom_obj_array)

The pbdom_obj_array array now contains one value representing the root element of pbdom_doc: <Root>.

To access the other nodes in pbdom_doc, the GetRootElement method is used with the GetContent method.

pbdom_doc.GetRootElement().GetContent &
   (ref pbdom_obj_array)

The pbdom_obj_array array now contains three values corresponding to the three child nodes of the root element of pbdom_doc: <Element_1>, <Element_2>, and <Element_3>.

PBDOM provides other methods for accessing data, including InsertContent, AddContent, RemoveContent, and SetContent.

You can use the AddContent method to change node content:

pbdom_obj_array[3].AddContent("This is Element 3.")

This line of code changes the node tree as follows:

<Root>
    <Element_1>
        <Element_1_1/>
        <Element_1_2/>
        <Element_1_3/>
    </Element_1>
    <Element_2/>
    <Element_3>This is Element 3.</Element_3>
</Root>