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Usually, databases place restrictions on the permitted values for given fields. For example, the SQL Server type called varchar is a string, with a certain maximum length set by the database designer. XSD Schemas also allow you to define such restrictions, by defining custom simple types that modify intrinsic XSD types according to your specific needs. This works by deriving a new type from a base type you select the base type, and then specify the required limitations. In this regard, XSD is similar to the way object-oriented programming languages work: you inherit an existing type and modify its behavior. However, in the case of XSD, you can either extend or restrict a base type, which is different from object-oriented programming, where inheritance is mainly a way to extend types. Try It Out: Define a Custom Simple Type A suitable use of a custom simple type in our example is to restrict valid IDs to strings of exactly 36 characters, which is what our database expects. Let s see how to go about arranging that. 1. From the Toolbox, drop a new simpleType element onto a blank area of the designer surface, and give it the name KeyDef. Note that, by default, the new type derives from the string type, as shown in the right-hand column on the top line. 2. On the blank row below the name and type, click the first column of the row and turn it into a facet, indicated by the capital F. Now open the drop-down list for the second column and select length. Tab to the next column, and enter 36.

The End position refers to the last element at the time the NavBarPage element is created In the previous example, End refers to the first element after Start when it is created You can use the Properties element of a file to set custom properties on the file, such as columns if you re storing the file in a library..

3. Set the ID items in the schema to the newly created simple type. There are two of them to change: the ID attribute on the <User> element and the PlaceID attribute of the <Friends> element. You ll see the new type shown in the drop-down list for the attribute type.

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<MenuVerbHoverStyle BackColor="#F7F6F3" BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="1px" ForeColor="#333333" /> <HeaderStyle Font-Size="0.7em" ForeColor="#CCCCCC" HorizontalAlign="Center" /> <MenuVerbStyle BorderColor="#5D7B9D" BorderStyle="Solid" BorderWidth="1px" ForeColor="White" /> <PartStyle Font-Size="0.8em" ForeColor="#333333" /> <TitleBarVerbStyle Font-Size="0.6em" FontUnderline="False" ForeColor="White" /> <MenuPopupStyle BackColor="#5D7B9D" BorderColor="#CCCCCC" BorderWidth="1px" Font-Names="Verdana" Font-Size="0.6em" /> <PartTitleStyle BackColor="#5D7B9D" FontBold="True" Font-Size="0.8em" ForeColor="White" /> </asp:WebPartZone> </td> </tr> </table> </div> </div> </form> </body> </html> Here you can see the HTML that was generated from the controls being placed on the web page. Let s look speci cally at the rst column in the table where you placed a Label control. 6. The Label control you placed in the rst column in the WebPartZone is going to display the local weather information. Note that to ensure that the weather information is displayed, a live Internet connection is needed. This information will be provided from The Weather Channel. Let s look at the label more closely. <ZoneTemplate> <asp:Label ID="Label1" runat="server" title="My Local Weather" Text="<script src='http://voap.weather.com/weather/oap /15205 template=GENXH&par=1009624279&unit=0& key=bce0ccdcde3556afd178545e369e6038'></script>" Height="53px"> </asp:Label> </ZoneTemplate> You now have all the content necessary within the WebPartZones.

AllUserWebPart will add a web part to a web part page. It is deceptively simple on the surface, exposing only two rather self-explanatory attributes, WebPartOrder and WebPartZoneId. The WebPartZoneId attribute is the ID of the web part zone in the web part page. If you take a look at the Default.aspx file that resides in the site definition folder for STS, or Figure 4-12, you will see two web part zones defined in the Main placeholder, one with the ID Left and one with the ID Right. If you were to insert an AllUserWebPart element into the Default.aspx file via the File element, one of these IDs would fit snugly in the WebPartZoneId attribute.

How It Works VS .NET offers a variety of restrictions, which it calls facets, on XSD built-in simple types. The available facets depend on the base type in use, and most are self-explanatory. For the KeyDef type, which is derived from the string simple type, you may have noticed that there were options for length and maxLength. Another useful facet is the enumeration, which allows you to define a list of valid string values.

document at http://www.w3.org/TR/xmlschema-0.

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