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Figure 5-2. Adding a new XSD schema to your project After you have added an XML schema, you will be presented with a canvas on which you can visually design the schema. The toolbox of Visual Studio will now show a node titled XML Schema, as shown in Figure 5-3.
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Figure 5-3. The XML Schema toolbox of Visual Studio As you can see in Figure 5-3, many of the schema parts that we discussed previously (simple type, complex type, element, attribute, and so on) are available in the toolbox. To begin creating the schema, drag and drop three simple types to the designer, and set their properties as shown in Figure 5-4.
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Figure 5-4. Creating simple types in Visual Studio For each simple type, you need to specify its name and data type. You can then right-click the individual simple type and choose Add New Facet. For NameSimpleType the facets are minLength and maxLength and have values of 3 and 255, respectively. The PhoneSimpleType simple type contains just one facet, maxLength, which is set to 20. Finally, NotesSimpleType contains the maxLength facet maxLength, which is set to 500. You can also open the properties window by selecting each simple type and set the values there. Now drag and drop a complexType onto the designer. You need to design it as shown in Figure 5-5.
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Figure 5-5. Creating a complex type in Visual Studio Type EmployeeType as the name for the complex type. Using the properties window, set the Order property of the EmployeeType element to All. This indicates that the subelements can appear in any order. Right-click the EmployeeType complex type, and add four new elements. Name the newly added elements firstname, lastname, homephone, and notes, respectively. Set the type of firstname and lastname to NameSimpleType, and homephone to PhoneSimpleType. Similarly, set the type of notes to NotesSimpleType. Now add a new attribute and name it employeeid. Specify its data type as int. Using the properties window, set its use property to required. This completes the EmployeeType complex type. Now drag and drop an element on to the designer, and name it employees. Using the shortcut menu, add a new element to it. Select the type of the element as EmployeeType. The employees element should now resemble Figure 5-6. If you wish to see the generated schema markup, right-click the schema designer, and select View Code. You should see something similar to what s shown in Figure 5-8. Compare the source to what we created in the previous example. You will find that it matches. Thus Visual Studio can effectively reduce the efforts needed to create a schema by offering a visual and friendly environment. This is a compelling factor for using it instead of manually creating the schema.
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Figure 5-6. Creating the <employee> element in Visual Studio This completes the creation of Employees.xsd. The completed schema is shown in Figure 5-7.
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Figure 5-7. The completed Employees.xsd in Visual Studio
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Figure 5-8. Viewing the generated source
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Creating the Schema from a Database Table
In many situations, the data contained in an XML document goes in and out of a database table. In such cases, the schema of your XML document can be derived from the underlying
CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
database table structure. You can of course create the schema manually as described previously, but there is a yet another way. Visual Studio has a built-in tool called Server Explorer that allows you to connect with the databases and manipulate database objects such as tables and stored procedures. Figure 5-9 shows the Server Explorer with the famous Northwind database opened.
Note You can open Server Explorer by choosing View Server Explorer from the Visual Studio menu. The Server Explorer window has a Data Connections node that lists previously added database connections. To add a new connection, you need to right-click the Data Connections node and choose the Add Connection option. The Add Connection dialog box opens, allowing you to specify connection string parameters.
Figure 5-9. Server Explorer of Visual Studio As you can see in Figure 5-9, Server Explorer has displayed a list of all the tables, such as Employees and Customers. Now suppose that you want to represent data from the Employees table as an XML file. It would be helpful in such a case if you could create an XSD schema that maps closely to the underlying table structure. This way, synchronizing the XML file with the database at a later stage will be easy. To see how an XSD schema can be created from a database table, add a new XML schema to your project. Then open Server Explorer and locate the desired table. If Server Explorer is not opened by default, you can open it by choosing View Server Explorer from the menu. Finally, drag and drop the table from Server Explorer onto the XML schema. That s it! The Visual Studio IDE is clever enough to create an equivalent XML schema. Figure 5-10 shows an XML schema generated by dragging and dropping the Employees table of the Northwind database onto the schema designer.
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