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Figure 5-14. Schema set of Visual Studio You can add or remove schemas from the cache by clicking the Add or Remove buttons, respectively. Once you ve added a particular schema, you can use it while writing an XML document by selecting the Use this schema option of the schema set dialog (see Figure 5-15).

6

For example, if you add an EndRequestHandler callback to the PageRequestManager, like this:

The <custom-window-state> element (Figure 6-9) defines a custom window state supported by this portlet. The portlet application can have zero or more custom window states. The <custom-window-state> element has a <window-state> element that contains the name of the window state, such as ICON. The <description> element is optional.

The XmlReader class provides you with a way to validate XML documents by using its Create() method, which accepts the URL of the XML document and an instance of the XmlReaderSettings class. The XmlReaderSettings class configures the XmlReader class and can be used to indicate your intention of validating XML documents. You can also wire up an event handler to receive notification about validation errors. The XmlReader instance returned by the Create() method can be used to read the XML document in the same way as you learned in 3. To illustrate how to use XmlReader to validate XML documents, you will develop an application like the one shown in Figure 5-16.

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

The portlet application can access information about the user, but the requested attributes must be explicit in the portlet deployment descriptor. Each user attribute the portlet requires needs to be defined in portlet.xml as a <user-attribute> element (Figure 6-10). The user attributes are optional, and there may be an unlimited number of them.

Figure 5-16. Application for validating an XML document by using the XmlReader class The application consists of two text boxes for accepting the XML document filename and the DTD or schema filename, respectively. The radio buttons indicate whether you are validating against a DTD or schema. Clicking the Validate button validates the document. Any errors encountered during the validation process are indicated via a message box. Listing 5-15 shows the complete code of the application. Listing 5-15. Validating an XML Document by Using XmlReader private void button1_Click(object sender, EventArgs e) { XmlReaderSettings settings = new XmlReaderSettings(); if(radioButton1.Checked) { settings.ProhibitDtd = false; settings.ValidationType = ValidationType.DTD; } else { settings.Schemas.Add("", textBox2.Text); settings.ValidationType=ValidationType.Schema; } settings.ValidationEventHandler += new ValidationEventHandler(OnValidationError); XmlReader reader = XmlReader.Create(textBox1.Text, settings); while (reader.Read()) { //you can put code here //that reads and processes //the document }

you can then access the AsyncPostBackErrorMessage from your JavaScript code as part of the args sent back to the EndRequestHandler:

The <user-attribute> tag has a <name> child element, which must be unique for the portlet application. The <description> element is optional. For more on user attributes, see 11.

<user-attribute> <name>user.name.given</name> </user-attribute> <user-attribute> <name>user.name.suffix</name> </user-attribute> <user-attribute> <name>user.home-info.postal.country</name> </user-attribute>

reader.Close(); MessageBox.Show("Validation over"); } If the XML document is to be validated against a DTD (as indicated by the radio buttons), the ProhibitDtd property of the XmlReaderSettings class is set to false. The ProhibitDtd property decides whether validation against a DTD is allowed. By default this property is true. If the document is to be validated against an XSD schema, the schema is added to the Schemas collection, which can accept an in-memory schema in the form of an XmlSchema class or a file path. The Add() method of the schemas collection used by our code accepts the target namespace and schema file path. The ValidationType property indicates whether the XmlReader should perform validation and whether to use a DTD or a schema. The ValidationType property is an enumeration of type ValidationType and has five possible values, as listed in Table 5-3.

function EndRequestHandler(sender, args) { var errorMessage = args.get_error().message; alert(errorMessage); }

The <security-constraint> element (Figure 6-11) has an optional display name, a portlet collection, and a user data constraint. The <portlet-collection> element has a set of <portlet-name> elements that reference portlets defined in the portlet application. The <user-data-constraint> element has a <transport-guarantee> element and an optional description.