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JSP already has an expression language to provide dynamic values for tag attributes using the ${}-syntax expressions. These expressions are fully evaluated to literal values before the tag handler can observe them. As a result, all information about the underlying data model is lost, preventing the JSF component from being able to post back values to the data model. Therefore, a different style of expression is required, the JSF #{}-syntax. This syntax is ignored by the JSP engine and passed as a String literal to the tag attribute. The JSF tag handler has an opportunity to parse the expression and retain knowledge of the underlying data model for use during postback. If the value is a literal, such as true, then the JSF tag handler converts this to a strongly typed literal value, such as Boolean.TRUE, before storing it as the component attribute value. The <rtexprvalue>, or runtime expression value, metadata is always set to false because JSP expression syntax is not supported by JSF tag handlers, and this will cause the JSP runtime to enforce that requirement.

An XML API would just not be complete without the ability to validate XML. So LINQ to XML has the ability to validate an XML document against an XML schema.

We will begin our discussion with the primary traversal properties. When directions (up, down, and so on) are specified, they are relative to the element the method is called on. In the subsequent examples, we save a reference to the first BookParticipant element, and it is the base element used for the traversal.

Traversing forward through the XML tree is accomplished with the NextNode property. Listing 7-42 is an example.

LINQ to XML has addressed the need for validation by creating the System.Xml.Schema.Extensions static class, which contains the validation methods. These validation methods are implemented as extension methods.

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If the custom action has attributes, the attributes have to be defined with the <attribute> element. For each attribute in the TLD, as shown in Code Sample 2-43, the <rtexprvalue> element must be set to false, and the attribute class must be left unspecified, allowing it to default to String. Code Sample 2-43. UIComponent Attributes <!-- UIComponent attributes --> <attribute> <name>id</name> <required>false</required> <rtexprvalue>false</rtexprvalue> <description>

XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XProcessingInstruction("BookCataloger", "out-of-print"), // Notice on the next line that we are saving off a reference to the first // BookParticipant element. new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); Console.WriteLine(firstParticipant.NextNode); Since the base element is the first BookParticipant element, firstParticipant, traversing forward should provide us with the second BookParticipant element. Here are the results: <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> Based on these results, we would say we are right on the money. Would you believe us if we told you that if we had accessed the PreviousNode property of the element, it would have been null since it is the first node in its parent s node list It s true, but we ll leave you the task of proving it to yourself.

Here is a list of some of the validation method prototypes available in the System.Xml.Schema.Extensions class: void Extensions.Validate(this XDocument source, XmlSchemaSet schemas, ValidationEventHandler validationEventHandler) void Extensions.Validate(this XDocument source, XmlSchemaSet schemas, ValidationEventHandler validationEventHandler, bool addSchemaInfo)

If you want to traverse the XML tree backward, use the PreviousNode property. Since there is no previous node for the first participant node, we ll get tricky and access the NextNode property first, obtaining the second participant node, as we did in the previous example, from which we will obtain the

void Extensions.Validate(this XElement source, XmlSchemaObject partialValidationType, XmlSchemaSet schemas, ValidationEventHandler validationEventHandler) void Extensions.Validate(this XElement source, XmlSchemaObject partialValidationType, XmlSchemaSet schemas, ValidationEventHandler validationEventHandler, bool addSchemaInfo)

PreviousNode. If you got lost in that, we will end up back at the first participant node. That is, we will go forward with NextNode to then go backward with PreviousNode, leaving us where we started. If you have ever heard the expression taking one step forward and two steps back, with just one more access of the PreviousNode property, you could actually do that. LINQ makes it possible. Listing 7-43 is the example.

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