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Listing 5-3. XSD Schema for Employees.xml < xml version="1.0" encoding="utf-8" > <xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="employees"> <xs:complexType> <xs:sequence> <xs:element name="employee" type="EmployeeType" minOccurs="0" maxOccurs="unbounded" /> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name="EmployeeType"> <xs:all> <xs:element name="firstname" type="NameSimpleType" /> <xs:element name="notes" type="NotesSimpleType" /> <xs:element name="lastname" type="NameSimpleType" /> <xs:element name="homephone" type="PhoneSimpleType" /> </xs:all> <xs:attribute name="employeeid" type="xs:int" use="required" /> </xs:complexType> <xs:simpleType name="NameSimpleType"> <xs:restriction base="xs:string"> <xs:minLength value="3" /> <xs:maxLength value="255" /> </xs:restriction> </xs:simpleType> <xs:simpleType name="PhoneSimpleType"> <xs:restriction base="xs:string"> <xs:maxLength value="20" /> </xs:restriction> </xs:simpleType> <xs:simpleType name="NotesSimpleType"> <xs:restriction base="xs:string"> <xs:maxLength value="500" /> </xs:restriction> </xs:simpleType> </xs:schema> The schema declaration starts with the <schema> tag. The XML namespace http:// www.w3.org/2001/XMLSchema is required and indicates that this is an XSD schema. The xmlns attribute specifies that the namespace prefix for all the tags of this schema will be xs. Then the schema declares the <employees> element by using the <element> tag. The <employees> element contains subelements named <employee>, which are of the complex type EmployeeType. The complex type is indicated by the <complexType> element. There can be zero or more occurrences of <employee> subelements as defined by the minOccurs and maxOccurs
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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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attributes, respectively. Note the use of the unbounded keyword to indicate that any number of the element can exist. Next the schema defines a complex type called EmployeeType by using the <complexType> element. The name attribute of <complexType> indicates the name of the complex type being defined. The EmployeeType complex type consists of four subelements and one attribute. The elements are declared by using the <element> tag and its two attributes, name and type. The name attribute specifies the name of the element, whereas the type attribute indicates the data type of the element. The attributes are declared by using the <attribute> tag. The name attribute of the <attribute> element specifies the name of the attribute, and the type attribute indicates the data type of the attribute. In our case, the employeeid attribute is of type int and is required, as indicated by the use attribute. Then the schema defines the NameSimpleType simple type by using the <simpleType> element. Because we want the data type of NameSimpleType to be string, we indicated this in the <restriction> element. The minimum and maximum length of the element is decided by the minLength and maxLength attributes, respectively. In our case, the names must be more than 3 characters in length and should not exceed 255 characters. The PhoneSimpleType simple type is defined next. It is a string not exceeding 20 characters. Finally, the NotesSimpleType simple type is defined. It is also a string, but it must not exceed 500 characters. That s it! After you type in the preceding markup in a plain-text editor, you can save the file as Employees.xsd. You will learn about attaching an XSD schema to an XML document in later sections.
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Creating the XSD Schema in Visual Studio Designer
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Creating an XSD schema in Visual Studio is easy, because the IDE provides visual tools to create elements, simple types, and complex types. To create a new XSD schema, you need to add one to your project by using the Add New Item dialog box. Name the new schema file Employees.xsd. Figure 5-2 shows the Add New Item dialog box with the relevant selection.
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Note Microsoft has removed support for XSD schema designer from Visual Studio 2008. Microsoft is working on a new tool that will replace the older designer. At the time of this writing, the new schema designer from Microsoft is in CTP1 stage and works only on Visual Studio 2008 Beta 2. Till the final version of the new designer is released, I expect that developers will either continue to use the XSD schema designer available in Visual Studio 2005 or use some third-party tool (such as XMLSpy). The next two sections of this chapter use the XSD schema designer available in Visual Studio 2005.
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