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Figure 5-10. XML schema generated from a database table As you can see in Figure 5-10, the designer has created an element called <Employees> that has subelements matching the columns in the database table. There is also another element called <Document> that has a single element called <Employees>, which is of type <Employees> as defined in this schema. If you right-click the schema designer and select the View Code menu option, you should see markup as shown in Listing 5-4. Listing 5-4. The Auto-generated Schema Markup < xml version="1.0" encoding="utf-8" > <xs:schema id="XMLSchema1" targetNamespace="http://tempuri.org/XMLSchema1.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/XMLSchema1.xsd" xmlns:mstns="http://tempuri.org/XMLSchema1.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="Document"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="Employees"> <xs:complexType> <xs:sequence> <xs:element name="EmployeeID" type="xs:int" /> <xs:element name="LastName" type="xs:string" /> <xs:element name="FirstName" type="xs:string" /> <xs:element name="Title" type="xs:string" minOccurs="0" /> <xs:element name="TitleOfCourtesy" type="xs:string" minOccurs="0" /> <xs:element name="BirthDate" type="xs:dateTime" minOccurs="0" /> <xs:element name="HireDate" type="xs:dateTime" minOccurs="0" /> <xs:element name="Address" type="xs:string" minOccurs="0" /> <xs:element name="City" type="xs:string" minOccurs="0" /> <xs:element name="Region" type="xs:string" minOccurs="0" /> <xs:element name="PostalCode" type="xs:string" minOccurs="0" /> <xs:element name="Country" type="xs:string" minOccurs="0" />
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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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<xs:element name="HomePhone" type="xs:string" minOccurs="0" /> <xs:element name="Extension" type="xs:string" minOccurs="0" /> <xs:element name="Photo" type="xs:base64Binary" minOccurs="0" /> <xs:element name="Notes" type="xs:string" minOccurs="0" /> <xs:element name="ReportsTo" type="xs:int" minOccurs="0" /> <xs:element name="PhotoPath" type="xs:string" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> <xs:unique name="DocumentKey1"> <xs:selector xpath=".//mstns:Employees" /> <xs:field xpath="mstns:EmployeeID" /> </xs:unique> </xs:element> </xs:schema> There are a few things that you may find worth noting. The root element is <Document>. Within the <Document> element, you can have an <Employees> element, which takes its name from the database table name. The SQL Server data types are mapped to the equivalent XSD data types. Thus the <EmployeeID> element has a data type of int, whereas the <BirthDate> element has a data type of dateTime. The EmployeeID column is a primary key column in the table, and it has been added as a primary key in the resultant schema also. (Notice the key icon in the designer or the <unique> tag at the bottom in the markup.) Though the schema is readily created for us, there are some limitations. First of all, the auto-generated schema does not create any simple types. Thus constraints such as minimum length and maximum length cannot be effectively enforced. Also, all the table columns appear as elements, which might be undesirable. For example, you may need the employee ID as an attribute rather than an element. You can of course modify the auto-generated schema to suit your needs.
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Note You can also generate XML schemas from views and stored procedures. In any case, the procedure
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remains the same. All you need to do is drag and drop the object onto the schema designer.
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Creating the Schema by Using the XML Schema Definition Tool
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The schema designer and Server Explorer together allow you to create a schema for a database table. Along the same lines, the XML Schema Definition tool allows you to create XSD schemas from the following: An existing XML document An existing XDR schema Types defined in an assembly (.exe or .dll)
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The XML Schema Definition tool is provided as xsd.exe and can be invoked from the Visual Studio command prompt. In the following sections, you will learn how to use this tool to create schemas from XML documents and assemblies. Creating the Schema from an XML Document Let s assume that you have the Employees.xml file with you and wish to create an XSD schema for it by using the xsd.exe command-line tool. To do so, first open the Visual Studio command prompt from the Visual Studio program group. Then enter the following command at the command prompt: xsd.exe "C:\Bipin\Pro XML\Employees.xml" /outputdir:"C:\Bipin\Pro XML" The first parameter is the path and filename of the XML file for which the schema is to be generated. The /outputdir switch specifies the folder where the resultant schema file should be created. After you invoke the command, you will find an .xsd file in the specified folder. By default the name of the schema file is the same as the XML filename. Listing 5-5 shows the schema generated by the tool. Listing 5-5. Schema Generated by the xsd.exe Tool < xml version="1.0" encoding="utf-8" > <xs:schema id="employees" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="employees" msdata:IsDataSet="true" msdata:UseCurrentLocale="true"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="employee"> <xs:complexType> <xs:sequence> <xs:element name="firstname" type="xs:string" minOccurs="0" msdata:Ordinal="0" /> <xs:element name="lastname" type="xs:string" minOccurs="0" msdata:Ordinal="1" /> <xs:element name="homephone" type="xs:string" minOccurs="0" msdata:Ordinal="2" /> <xs:element name="notes" type="xs:string" minOccurs="0" msdata:Ordinal="3" /> </xs:sequence> <xs:attribute name="employeeid" type="xs:string" /> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema>
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