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An exception occurred processing object type XElement. The element 'BookParticipant' has invalid child element 'MiddleName'. List of possible elements expected: 'LastName'. Element BookParticipants is Invalid Schema element BookParticipants must have MinOccurs = 1 and MaxOccurs = 1 Element BookParticipant is Invalid Schema element BookParticipant must have MinOccurs = 1 and MaxOccurs = 79228162514264337593543950335 Element FirstName is Valid Schema element FirstName must have MinOccurs = 1 and MaxOccurs = 1 Element MiddleName is Invalid Element LastName is NotKnown Element BookParticipant is Valid Schema element BookParticipant must have MinOccurs = 1 and MaxOccurs = 79228162514264337593543950335 Element FirstName is Valid Schema element FirstName must have MinOccurs = 1 and MaxOccurs = 1 Element LastName is Valid Schema element LastName must have MinOccurs = 1 and MaxOccurs = 1 There are no real surprises in this output. Notice that the MaxOccurs property value for the BookParticipant element is a very large number. This is because in the schema, the maxOccurs attribute is specified to be "unbounded". For the final pair of validation examples, I will use one of the Validate method prototypes that applies to validating elements. The first thing you will notice about it is that it has an argument that requires an XmlSchemaObject to be passed. This means the document must have already been validated. This seems odd. This is for a scenario where we have already validated once and need to revalidate a portion of the XML tree. For this scenario, imagine I load an XML document and validate it to start. Next, I have allowed a user to update the data for one of the book participants and now need to update the XML document

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 XComment("This is a new author."), new XProcessingInstruction("AuthorHandler", "new"), new XAttribute("type", "Author"), new XElement("FirstName", new XText("Joe"), new XElement("NickName", "Joey")), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"),

new XElement("LastName", "Buckingham")))); foreach (XElement element in firstParticipant. Element("FirstName").Element("NickName").AncestorsAndSelf()) { Console.WriteLine(element.Name); } The results should be the same as when calling the Ancestors method, except we should also see the NickName element s name at the beginning of the output: NickName FirstName BookParticipant BookParticipants

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to reflect the user s changes, and I want to validate that portion of the XML tree again, after the updates. This is where the Validate method prototypes of the elements and attributes can come in handy. Because this example, shown in Listing 9-18, is more complex than some of the previous examples, I will explain it as I go. First, to be a little different, and because I need an expanded schema to facilitate an edit to the XML tree, I will define the schema programmatically instead of loading it from a file, as I have in the previous examples. Listing 9-18. Successfully Validating an XML Element string schema = @"< xml version='1.0' encoding='utf-8' > <xs:schema attributeFormDefault='unqualified' elementFormDefault='qualified' xmlns:xs='http://www.w3.org/2001/XMLSchema'> <xs:element name='BookParticipants'> <xs:complexType> <xs:sequence> <xs:element maxOccurs='unbounded' name='BookParticipant'> <xs:complexType> <xs:sequence> <xs:element name='FirstName' type='xs:string' /> <xs:element minOccurs='0' name='MiddleInitial' type='xs:string' /> <xs:element name='LastName' type='xs:string' /> </xs:sequence> <xs:attribute name='type' type='xs:string' use='required' /> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:schema>"; XmlSchemaSet schemaSet = new XmlSchemaSet(); schemaSet.Add("", XmlReader.Create(new StringReader(schema))); In the previous code, I merely copied the schema from the file that I have been using. I did a search on the double quotes and replaced them with single quotes. I also added a MiddleInitial element between the FirstName and LastName elements. Notice that I specify the minOccurs attribute as 0 so the element is not required. Next, I create a schema set from the schema. Next, it s time to create an XML document: XDocument xDocument = new XDocument( new XElement("BookParticipants", 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("Here is the source XML document:"); Console.WriteLine("{0}{1}{1}", xDocument, System.Environment.NewLine);

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