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if( node.isText() ) { QDomText text = node.toText(); qDebug() << text.data(); } node = node.nextSibling(); } Listing 8-14 simply lists the child nodes of the root node. If you want to be able to traverse DOM trees with more levels, you have to use a recursive function to look for child nodes for all element nodes encountered.

It is worth being aware that if you install packages to /Library/Python/2.5/site-packages and then use virtualenv to install Pylons to a local directory, any applications you run from the local directory won t be able to find those in the /Library/... path, so it is always best to install everything locally. If you encounter this problem, you can fix it by running Easy Install from your virtual Python environment for each of the packages that appear to be missing. Easy Install will then find them and add them to virtual Python environment's easy-install.pth file.

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Being able to read and write DOM trees is all you need to know in many applications Keeping your application s data in a custom structure and translating your data into a DOM tree before saving and then extracting your data from the DOM tree when loading is usually enough When the DOM tree structure is close enough to your application s internal structure, it is nice to be able to modify the DOM tree on the fly, which is what happens in Listing 8-15 To put the code in the listing in a context, you need to know that the document has been loaded from a file before this code is run When the code has been executed, the document is written back to the same file You find the root node using documentElement, which gives you a starting point.

If you are using Windows 95, 98, NT, 2000, ME, XP, 2003 Server, or Vista, you can download the Python installer from http://python.org/download/. Once you have downloaded the correct version for your platform (which will usually be the x86 version), you simply double-click the installer file and follow the installation instructions (see Figure 2-1).

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Note To use the installer, the Windows system must support Microsoft Installer (MSI) 2.0. Just save the installer file to your local machine, and then run it to find out whether your machine supports MSI. Windows XP and newer already have MSI, but many older machines will already have MSI installed too. If your machine does not have the Microsoft Installer, you can download it:

Then you ask the root node for a list of all author tags (all elements with the tagName property set to author) by using the elementsByTagName(const QString &) method If the list is empty, add an author element to the root node The freshly created element is added to the root node using insertBefore(const QDomNode &, const QDomNode &) Because you give an invalid QDomNode object as the second parameter to the method, the element is inserted as the first child node If the list contains an author element, you add a revision element to it The revision element is given an attribute named count, whose value is calculated from the number of revision elements already in the author element That s all it takes Because the nodes have been added to the DOM tree, you just need to save it again to get an updated XML file Listing 8-15.

Ready-to-use HTML escape functions are available in libraries in many programming languages. It is advisable to carefully check the documentation or source code (if available) that all necessary characters are indeed escaped. For example, it is easily overlooked that the Python function cgi.escape (available in the library included in the standard Python distribution) does not escape quote characters unless requested via an optional argument, and even then only escapes double-quote characters. In certain contexts, we require other escaping functions (e.g., for JavaScript string literals); we introduce these functions in the appropriate context.

Windows 95, 98, and ME platforms use this version: http://www.microsoft.com/downloads/ details.aspx FamilyID=cebbacd8-c094-4255-b702-de3bb768148f&displaylang=en. Windows NT 4.0 and 2000 use this version: http://www.microsoft.com/downloads/ details.aspx FamilyID=4b6140f9-2d36-4977-8fa1-6f8a0f5dca8f&DisplayLang=en.

Modifying an existing DOM tree QDomNodeList elements = documentElementelementsByTagName( "author" ); if( elementsisEmpty() ) { QDomElement a = documentcreateElement( "author" );.

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