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The root node of the XML file is the Database element. Here we specify the name of the database we re mapping to. The Database can have multiple Table elements. Each Table B element contains a Type element, which indicates the class we use when mapping the given table. The Type C can have any number of Column and Association elements. The attributes for the Column D and Association element include one additional value not included in the attribute based version we previously used Member. Since we re not directly decorating individual properties using attributes, we need to specify which property (or Member) the column mapping applies to. Given what we learned previously about the Table, Column, and Association attributes, we can transfer the attributes from the class declarations directly into the Column and Association elements, remembering to add the Member attribute. In order to use our new mapping file, we need to instruct the DataContext to use the mapping rather than rely on the default attribute based declaration. In listing 7.2, we show how to attach an external mapping file (lia.xml) to the DataContext and then query our undecorated business objects using the XML mappings.

You specify commands (either on the command line or in a script file) and a set of files as program parameters The stream-editing program applies the editing commands to each file and outputs the new, transformed text The most popular stream-editing program is sed It has been around since the early days of UNIX; over the years it has become less popular, primarily due to the development and popularity of scripting languages such as Perl, Python, and Ruby However, sed is still a very useful and powerful editing tool For example, it accepts input from standard input, so you can easily pipe a text file into sed, have it apply the editing commands to the input, and output the new text, all in one command You can use stream-mode editing tools for Mac OS X development.

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Notice that the methods are the WMI methods for that particular WMI object, and not the methods for WMI. If you want those, you can still get them using the PSBase property. (If you remember from chapter 8, PSBase is the way to bypass the type adapter and get at the native capabilities of an object.)

For example, FileMerge, a GUI-based file comparison and merging program located in the /Developer/Applications folder, is implemented as a GUI application that uses the UNIX diff command, outputting its result to an ed script Later in the chapter you ll see how this works; for now, look at figure 41, which shows the result of searching the process table for the diff command as FileMerge is comparing two large files As you can see from this example, there is still a place for UNIX command-line tools in the modern age!.

ProvisioningAssembly class 377 ProvisioningClass class 377 proxies 185 public facing web sites 19 publishing 11, 18 19, 156, 360 Publishing Infrastructure 235 PublishingLayoutPage class 19

we could have made the TextBox read-only, but in some situations, we might want to allow direct editing (for example, to allow the user to clear the value). What we need is a chance to handle the event before the TextBox. So, instead of waiting for an event to bubble up from where it originated in the hopes that we re the first to handle it, we want to be the first to catch it before it gets given to some nasty control that might do something unspeakable to it before we have our chance. With many input events (keyboard, mouse, Ink, and so on), in addition to the bubble-up Figure 7.3 Using a bubble-up event when event, there is also a second event that, rather focus is on the text box causes a bad side than bubbling up, tunnels down, starting with the effect the text box gets the keystroke and enters the key, and then our handler top of our visual tree and working down to the gets it and handles the key properly. control with focus. For the keyboard, these events are called PreviewKeyDown and PreviewKeyUp. It s a convention for tunnel-down events to be prefixed with the word Preview and to have a matching bubble-up event without the word Preview to allow for complete flexibility. All the higher-level controls have a chance to preview the event and handle it if they see fit. If it isn t handled, then the regular bubbling event is fired and bubbles up until it is handled. Table 7.1 shows how a keystroke is routed if not handled.

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