介绍：
    TinyXML 是一个小型的但效率高、功能完整的 XML 解析工具，属于开源中的一员。
它采用 C++ 开发，采用 XML 文档、节点对象访问 XML 文件。下载：
    http://sourceforge.net/projects/tinyxml/

加载 XML 文档：

    TiXmlDocument doc(filename);
    if (!doc.LoadFile()) {
        printf("Cannot load XML source file: %s.rn", filename);
        return false;
    }

遍历 XML 的所有节点：

// ---------------------------------------------------------------------------
// recusive process this node and all children
int XML_GlobalTreeNode(TiXmlNode *rootnode, int (* process)(TiXmlNode *node))
{
    // TODO
    string name;
    TiXmlNode *subnode;

    // Process
    if (rootnode == NULL) {
        printf("GlobalProcessXML: root node is NULLrn");
        return -1;
    }

    // if function process returns zero, searching will be continued
    // otherwize(non-zero) searching will be breaked
    if (process(rootnode))
        return 0;

    // Process every child Node
    subnode = rootnode->FirstChild();
    while (subnode) {
        if (!subnode->NoChildren()) {
            XML_GlobalTreeNode(subnode, process);
        }
        else {
            if (process(subnode))
                return 0;
        }

        subnode = subnode->NextSibling();
    }
    return 0;
}

处理节点：

// ---------------------------------------------------------------------------
// register keyword by  in XML document
int XML_RegisterKeywords(TiXmlNode *node)
{
    string keywords;

    if (node->Type() == TiXmlNode::ELEMENT) {
        if (!stricmp(node->Value(), "meta")) {
            if (!stricmp(node->ToElement()->Attribute("name"), "keywords")) {
                keywords = node->ToElement()->Attribute("content");
                printf("Register: rntURL=%srntKeyword=%srn",

		g_CurrentURL.c_str(), keywords.c_str());

                // one XML file can only contains one  attribute
                // so if we get it, no needs to continue with this file
                return 1;
            }
        }
    }
    return 0;
}