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Therefore, in this chapter, we ve written the XML Schema that precisely describes the structure to which the expected XML documents must adhere When we receive such a document, we will validate it against the XML Schema to ensure it has the correct structure, and thus is usable As you ve seen, the XML Schema definition document (an XSD file) is itself written in XML Perhaps this sounds a little confusing, but it really makes a lot of sense: a schema document is a structured block of data, so it s logical to describe it using special XML tags (like <element> and <attribute>) that define the allowed elements and attributes in an XML data document The exact description of all the permitted elements and attributes in an XSD is contained in a schema within the namespace http://wwww3org/2001/XMLSchema.

There may be situations where I still want the code Perhaps I want to take a backup of a web part before removing it from the page Perhaps I want to manually edit the file for a new site Perhaps I want to study how ListViewWebPart works Perhaps I even want to add it to an AllUsersWebPart element I want that code, and if you do as well, here s how to get it... Open the web page hosting the web part in Microsoft SharePoint Designer 2007 Then, select the web part in Design mode Now, switch to Split view, and you should see the web part code marked Copy the code, and use it as you see fit.

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XML in general, and XML Schemas in particular, are quite advanced topics, and there are many aspects that we have left untouched For more in-depth information, try the following books: Definite XML Schema, by Priscilla Walmsley (Prentice Hall; ISBN: 0-13065-567-8) Pro NET XML, by Kent Tegels (Apress; ISBN: 1-59059-366-9).

Sometimes, you need to keep some data globally available to all users, who can share it. Of course, you can think of a database record as application-level state: all users can query it as needed. The performance impact would be unacceptable though, especially if it s used very often. Additionally, it involves several steps, such as opening the connection, issuing a query,

Note that you will likely not get much practical use out of the code, because it is far too tied to the underlying list and the views of that list, and in any case, setting up a list view from scratch is a lot easier than trying to force a copied web part to behave But you should know you have the option..

Figure 9-4. Web Parts and WebPartZones during runtime in browse mode The page displays the Web Parts you have built. You can see the local weather information along with a simple calendar. 9. Click on the drop-down list, and chose the Design option. This will put the page in edit mode and allow you to change the layout of the Web Parts (Figure 9-5).

and managing the results, just as you learned in 4. What s more, you would be limited to storing records, not arbitrary objects.

If you are reading this text electronically and have the option of cutting and pasting the text, don t. Tip Exploring the attributes of an element using IntelliSense is a great way of learning about new attributes as well.

You could actually use serialization to store objects. You can find information about object serialization Tip in the MSDN documentation. Search for Serializing Objects in the index of the .NET Framework Developer s Guide topics.

Figure 9-5. Web Parts and WebpartZones during runtime in design mode Notice that you can now see the third WebPartZone that was placed in the right column of the table. Because you purposely did not include any content, it displays a message saying Add a Web Part to this zone by dropping it here. Click on the headers of the Web Parts and move each of them to different zones (Figure 9-6).

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