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The method you will use most to add nodes to an XML tree is the Add method. It appends a node to the end of the specified node s child nodes. Listing 7-63 is an example. Listing 7-63. Adding a Node to the End of the Specified Node s Child Nodes with Add // A document with one book participant. XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Element("BookParticipants").Add( new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham"))); Console.WriteLine(xDocument); In the previous code, you can see I start with the base code and then add a BookParticipant element to the document s BookParticipants element. You can see I use the Element method of the document to obtain the BookParticipants element and add the element to its child nodes using the Add method. This causes the newly added element to be appended to the child nodes: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> The Add method adds the newly constructed BookParticipant element to the end of the BookParticipants element s child nodes. As you can see, the Add method is every bit as flexible as the XElement constructor and follows the same rules for its arguments, allowing for functional construction.

C a utio n Although XML document types apply to an XML document as a whole and should be added to an XML document, an XElement object will gladly accept an XDocumentType object being added to it. However, this will not be the result you want.

You can create a document type and add it to an XML document on the fly using functional construction, as in Listing 7-23.

XContainer.AddFirst()

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Code Sample 2-29. UIInput-Inherited Attributes <!-- UIInput attributes --> <attribute> <description> Converter instance registered with this component. </description> <attribute-name>converter</attribute-name> <attribute-class>javax.faces.convert.Converter</attribute-class> </attribute> <attribute> <description> Flag indicating that this component's value must be converted and validated immediately (that is, during Apply Request Values phase), rather than waiting until Process Validations phase. </description> <attribute-name>immediate</attribute-name> <attribute-class>boolean</attribute-class> </attribute> <attribute> <description> Flag indicating that the user is required to provide a submitted value for this input component. </description> <attribute-name>required</attribute-name> <attribute-class>boolean</attribute-class> </attribute> <attribute> <description> MethodBinding representing a validator method that will be called during Process Validations to perform correctness checks on the value of this component. The expression must evaluate to a public method that takes FacesContext, UIComponent, and Object parameters, with a return type of void. </description> <attribute-name>validator</attribute-name> <attribute-class>javax.faces.validator.Validator</attribute-class> </attribute> <attribute> <description> The current value of this component. </description> <attribute-name>value</attribute-name> <attribute-class>java.lang.Object</attribute-class> </attribute>

XDocument xDocument = new XDocument(new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XElement("BookParticipant")); Console.WriteLine(xDocument); This code produces the following results:

To add a node to the beginning of a node s child nodes, use the AddFirst method. Using the same code as before, except calling the AddFirst method, gives you the code in Listing 7-64.

<!DOCTYPE BookParticipants SYSTEM "BookParticipants.dtd"> <BookParticipant /> Sometimes, however, you can t create the document type at the same time the document is being constructed. For that, you must instantiate one and then add it to the document as in Listing 7-24.

Listing 7-64. Adding a Node to the Beginning of the Specified Node s Child Nodes with AddFirst // A document with one book participant. XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Element("BookParticipants").AddFirst( new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham"))); Console.WriteLine(xDocument); As one would expect, the newly added BookParticipant element will be added to the head of the BookParticipants element s child nodes: <BookParticipants> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Can XML manipulation get any easier than this I submit that it cannot.

<attribute> <description> MethodBinding representing a value change listener method that will be notified when a new value has been set for this input component. The expression must evaluate to a public method that takes a ValueChangeEvent parameter, with a return type of void. </description> <attribute-name>valueChangeListener</attribute-name> <attribute-class>javax.faces.event.ValueChangeListener</attribute-class> </attribute> Finally, in Code Sample 2-30, you add the renderer-specific attribute you need for your ProInputDate component, title. You also set the object type for the attribute, java.lang.String. Code Sample 2-30. ProInputDate Attributes <!-- ProInputDate attributes --> <attribute> <description> The title, or tooltip, to use for the rendered markup of this component. </description> <attribute-name>title</attribute-name> <attribute-class>java.lang.String</attribute-class> </attribute> </component> ... </faces-config>

XDocument xDocument = new XDocument(); XDocumentType documentType = new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null); xDocument.Add(documentType, new XElement("BookParticipants")); Console.WriteLine(xDocument); The following is the result of this code: <!DOCTYPE BookParticipants SYSTEM "BookParticipants.dtd"> <BookParticipants /> Notice in the previous code that we did not add any elements prior to adding the document type. If you do add a document type after adding any elements, you will receive the following exception: Unhandled Exception: System.InvalidOperationException: This operation would create an incorrectly structured document. So if you are going to specify a document type after the document s instantiation, make sure you do not specify any elements during the document s instantiation using functional construction or add any elements prior to adding the document type.

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