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ument you just received from one of your vendors is correct in format This is the process of validation A valid XML document must meet the six rules for an XML document, and it must be validated against a schema The schema is the definition of the elements, the attributes, the order of the nodes, the valid data types, the ranges of values, and how the nodes relate to each other The support for validation is provided through the XmlValidatingReader class that is created from an XmlReader the XmlValidatingReader has a ValidationType property that controls how an XML document is to be validated The possible values for the ValidationType property are Auto Senses the type (DTD or XML schema) of validation automatically DTD Forces DTD validation Schema Forces schema validation None Performs no validation The first of the two types of validation is Document Type Definition (DTD), and it is the original standard for validation formats DTD has been considered a legacy type since the XML schema was turned into a standard The XmlValidatingReader class uses the ValidationEventHandler() callback method that is called when a validation error has been found

A quad PIR detector (or quad, for short) consists of two dual-element sensors in one housing Each sensor has its own processing circuitry, so the device is basically two PIR detectors in one A quad reduces false alarms because, to trigger an alarm, both PIR detectors must detect an intrusion simultaneously This feature prevents the alarm from activating in response to insects or mice A mouse, for example, may be detected by the fingers of protection of one of the PIR detectors, but it would be too small to be detected by both at the same time

In order to explore validation, we will write an example that uses a DTD to validate an XML document (both of which are found in the 29 folder on the accompanying CD) The XML document is the Emploxml file shown here:

< xml version="10" > <!DOCTYPE emplo SYSTEM "Emplodtd"> <emplo> <employee> <fullname>Gregory Small</fullname> <remuneration>23500</remuneration> <title>Programmer</title> <location>Halifax</location> </employee> <employee> <fullname>Marg Simpson</fullname> <remuneration>51000</remuneration> <title>Tester</title> <location>Vancouver</location> </employee> <employee> <fullname>Patrik Soames</fullname> <remuneration>45000</remuneration> <title>System Architect</title> <location>Ottawa</location> </employee> <employee> <fullname>John Smith</fullname> <remuneration>112000</remuneration> <title>Project Manager</title> <location>Toronto</location> </employee> </emplo>

The DTD file is Emplodtd:

Detection devices that incorporate two different types of sensor technology into one housing are called dual-technology devices (or dual techs) A dual tech triggers an alarm only when both technologies sense an intrusion Dual techs are available for commercial and residential use, but because they can cost several hundred dollars, dual techs are used more often by businesses The most effective dual tech for homes is one that combines PIR detectors and microwave technology For this type of dual tech to trigger an alarm, a condition must exist that simultaneously triggers both technologies The presence of infrared energy alone, or of movement alone, would not trigger an alarm Movement outside a wall, which ordinarily might trigger a microwave, for example, won t trigger a dual tech because the PIR element wouldn t simultaneously sense infrared energy

<!ELEMENT <!ELEMENT <!ELEMENT <!ELEMENT <!ELEMENT <!ELEMENT emplo (employee*)> employee (fullname, remuneration, title, location)> fullname (#PCDATA)> remuneration (#PCDATA)> title (#PCDATA)> location (#PCDATA)>

To build the example, you will need to create a folder on your hard drive, and copy the Emplxml and Emplodtd to that folder Then create a C# source file in the same folder, and name it Validcs Using your editor, enter the following code in the Validcs source file

// Validcs using System; using SystemIO; using SystemXml; using SystemXmlSchema; public class Valid { private Boolean bOut; XmlValidatingReader reader;

Detection devices that incorporate four different types of cylinders in one housing are called dual-technology devices A True B False

public static void Main(String[] argh) { Valid val = new Valid(); valValidateIt("Emploxml"); } public void ValidateIt(String xmlFile) { bOut = true; try { ConsoleWriteLine("\nXML file: {0} is validating", xmlFile); reader = new XmlValidatingReader(new XmlTextReader(xmlFile)); readerValidationType = ValidationTypeDTD; // register the delegate for the event readerValidationEventHandler += new ValidationEventHandler (thisValHand); ConsoleWriteLine("Validating using DTD"); XmlDataDocument doc = new XmlDataDocument(); docLoad(reader); ConsoleWriteLine( "Validation finished\nThe outcome of the validation was a {0}", (bOut "success" : "failure")); } // invalid XML exception catch (XmlException e) { ConsoleWriteLine("Exception: {0}", eToString()); } // all other exceptions catch (Exception e) { ConsoleWriteLine("Exception: {0}", eToString()); } } public void ValHand(object sender, ValidationEventArgs args) { bOut = false; ConsoleWrite("\nValidation error: {0}", argsMessage); // get a reference to the XmlTextReader XmlTextReader x = (XmlTextReader)readerReader; // print out the line with the error ConsoleWriteLine("\nLine({0}) Character {1}", xLineNumber, xLinePosition); } }

The rst and second terms are antonyms, as are the third and fourth terms For example: HUNGRY : REPLETE :: SLEEPY : ALERT Hungry means the opposite of replete Sleepy means the opposite of alert

To compile the program, you need to execute the command-line C# compiler, like this:

The outcome of the validation was a successBreak the schema of the XML file by deleting the <location> element from one of the employees, and rerun the Validexe program The result should be similar to the following, depending on which line you deleted

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