xml 中 nodeValue 的用意

// xml code
<?xml version="1.0"?>
<root>
Welcome to HBBlog!
</root>

// flash code
var txt_xml:XML = new XML();
txt_xml.ignoreWhite = true;
txt_xml.onLoad = function(success) {
if (success) {
root= txt_xml.firstChild.firstChild;
trace(root); // Welcome to HBBlog!
rootValue = root.nodeValue;
trace(rootValue); // Welcome to HBBlog!
trace(root == rootValue) // false
}
};
txt_xml.load("txt.xml");

// xml code
<?xml version="1.0"?>
<root>
Welcome to &lt;HBBlog&gt;!
</root>

// flash code
var txt_xml:XML = new XML();
txt_xml.ignoreWhite = true;
txt_xml.onLoad = function(success) {
if (success) {
root= txt_xml.firstChild.firstChild;
trace(root); // Welcome to &lt;HBBlog!&gt;
rootValue = root.nodeValue;
trace(rootValue); // Welcome to <HBBlog!>
trace(root == rootValue) // false
}
};
txt_xml.load("txt.xml");