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You should also ensure that the XML document matches its schema or conforms to the constraints defined by its DTD. For example, if you specify the age of an employee to be between 18 and 60 years in the schema of your XML document, the actual data in your XML document must conform to the condition or it will be considered invalid. You can ensure the validation of XML documents by using the Xml Validating-Reader class. The Xml Validating Reader class is a derived class of the Xml Reader class and adds validation support to the Xml Text Reader class. When you load Xml Validating Reader to validate an XML document against its DTD, Xml Validating Reader uses the DTD defined in the DOCTYPE declaration of the XML document. Table 6.10 Parsing of XML Fragments In the previous lesson, you learned how to validate an XML document using XML Schema. The following code displays how to create an Xml Validating Reader class that takes an XML document as the input and validates it against an external DTD file, You also learned about the Xml Validation Reader class. The Xml Validating Reader class provides the DTD, XML-Data Reduced (XDR), and XSD schema validation services that allow you to validate an XML document or a fragment of an XML document. The Xml Validating Reader class takes Xml Text Reader as the input and applies the properties that you specify in the Xml Text Reader class.
For example, Microsoft SQL Server 2000 allows you to obtain the result of a query in the form of an XML document, which can be validated against an XDR schema.
All severity types and error messages are displayed. In this lesson, you will learn how to populate a Data Set with data from an XML document.
Figure 6.3 shows the results of validating the file using an external DTD file. In addition, you will learn how to write XML documents using data from a data source.
Table 6.9 displays the validations that are performed when you set the Validation Type property to None.
Table 6.9 Validations Performed by Validation Type. Message) end subend class You can use Xml Validating Reader to read XML fragments.