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CHAPTER 2 TAKING A CRASH COURSE IN XML
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CAML, which takes much of the pain of writing CAML code out of the equation. For example, the following: query.Query = @"<Where><Eq><FieldRef Name='Title'/><Value Type='Text'> My title</Value></Eq></Where>"; magically turns into this: query.Query = CAML.Where( CAML.Eq( CAML.FieldRef("Title"), CAML.Value("Text", "My title") ) ); which is a lot easier to read, not to mention easier to write. Suddenly you have strong typing for inline CAML code, including IntelliSense support. Your days of misspelling queries or forgetting an ending tag in a complex query are over. This is all good, but it doesn t really give you anything unless you know the CAML query in advance. As you will see in later chapters, defining views can be a bit complex. Having a tool to help us create the views would be great.
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U2U CAML Query Builder, or CQB for short, is a SharePoint add-in that allows you to get the CAML query of a view. The solution adds a custom action to the Actions menu on every list in your site collection. The custom action leads to an application page that contains the functionality of the solution.
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Note Custom actions will be covered in 5.
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You define the view almost as you would define any other view in the web interface. Then CQB displays the CAML code for the view for you to use in your code. CQB even allows you to create C# and VB .NET code for the view, including a wrapper class that you can plug into your class. Figure 2-1 shows an example of how the CQB can create CAML queries for you.
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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Figure 2-1. U2U CAML Query Builder query result Going from CAML to CAML.net is trivial if you prefer to work with an object model approach. U2U CAML Query Builder is a nagware tool, available from http://www.u2u.net. However, registration is just 10. U2U also has a powerful Windows version of its Query Builder tool available from the same site. It s even more flexible but lacks the SharePoint integration, so I will hide behind my statement of not focusing too much on tools and instead leave the exploration to you.
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XSLT
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There is another technology that you might want to investigate, and I ll tell you why in a moment. Extensible Stylesheet Language Transformations (XSLT) is used to convert XML into something else. XML by itself is about as useful as square wheels, so most of the time you ll actually want XML to be something other than XML. XSLT enters the scene and answers all our prayers. And, if you don t pray, it will still be very helpful. Basically, XSLT is an XML-based language, just like XSD, that tells an XSLT processor how to convert your XML to another language. Now, XSLT is a somewhat complex language. First, there are two main versions, 1.0 and 2.0. Second, there are numerous XSLT processors, and each varies slightly in how they interpret the standards. Third, XSLT requires a different method of thinking than your regular run-of-the-mill parse-from-the-top thinking to which you might have become accustomed.
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CHAPTER 2 TAKING A CRASH COURSE IN XML
For example, XSLT relies heavily on the notion of templates to transform XML. Templates are called from anywhere in the XSLT file, whenever a certain element is matched in the XML file. This means you will need to think more like an event-driven parser. XSLT is somewhat important to SharePoint version 3 in that the DataForm web part relies on using XSLT to transform XML from a query into HTML for display. If you want to manipulate the DataForm web part results, learning XSLT is an absolute must. However, there is an even more important reason why you should learn XSLT. Starting with the next version of SharePoint, XSLT will replace CAML as the main rendering language for views. CAML will still be used extensively in other areas of SharePoint, but view rendering will change. And, even though the next version of SharePoint will support XSLT to a much greater extent, SharePoint 3 still relies on CAML. 7 deals with CAML as a rendering language and is thus useful if you plan on working with SharePoint 3. If you want to learn more about XSLT, I recommend the book Beginning XSLT: From Novice to Professional by Jeni Tennison (Apress, 2005). You can also stop by http://www. understandingsharepoint.com/training for a six-part introduction course to XSLT.
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