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And finally, the user s professional e-mail address and web site:

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

Clicking Next will begin the installation. You ll see the installation status screen (see Figure 12-3).

The main problem with user attributes is that they won t necessarily be available to your portlet. Although support for them is a mandatory part of the JSR 168 specification, all of the individual attributes are optional, so the requirement has very little real force. As a result, your portal may support user attributes in name alone.

CAUTION At the time of writing, Pluto and most other open source portlet containers do not support user attributes.

The installation is pretty straightforward. Once it has installed successfully, you ll see a completion screen (see Figure 12-4).

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.