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c# code 39 checksum CH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS in Visual C#.NET
CH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS Create Code 39 In Visual C# Using Barcode printer for .NET framework Control to generate, create Code 3 of 9 image in .NET applications. www.OnBarcode.comCode 3 Of 9 Recognizer In C#.NET Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comIn the preceding example, our XML document doesn t use a namespace. If it did, we would have to make two changes to our schema and XML documents: Add the targetNamespace attribute to the schema declaration. Use the xsi:schemaLocation attribute instead of the xsi:noNamespaceSchemaLocation attribute. Listing 5-13 shows the modified schema, and Listing 5-14 shows the modified XML document. Listing 5-13. Schema with Target Namespace <xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="myns" xmlns="myns"> ... As you can see, the schema now has a targetNamespace attribute that specifies the target namespace as myns. The XML document must use this namespace, as illustrated in Listing 5-14. Listing 5-14. XML Document with Namespace <myns:employees xmlns:myns="myns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="myns employeesns.xsd"> <myns:employee myns:employeeid="1"> <myns:firstname>Nancy</myns:firstname> ... Note the markup in bold. The root element now declares a namespace called myns, and instead of xsi:noNamespaceSchemaLocation it now uses an xsi:schemaLocation attribute. Observe carefully how the attribute value is specified: it must contain the namespace name, a space, and then the URL of the XSD file. Code 39 Extended Encoder In Visual C#.NET Using Barcode generator for .NET framework Control to generate, create Code 3 of 9 image in VS .NET applications. www.OnBarcode.comGenerating GTIN - 128 In Visual C# Using Barcode generation for VS .NET Control to generate, create UCC - 12 image in VS .NET applications. www.OnBarcode.comAdding Frequently Used Schemas to the Schema Cache
PDF 417 Creator In C#.NET Using Barcode creator for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications. www.OnBarcode.comUPC Symbol Creator In Visual C# Using Barcode creator for .NET Control to generate, create UPC-A Supplement 5 image in VS .NET applications. www.OnBarcode.comIf you find yourself using the same schema files again and again, consider adding your schema to the schema cache. Once you store a schema in the schema cache, you can access it readily in the XML editor of Visual Studio. The schema cache can be seen from the XML Schemas menu option of Visual Studio. Note that the XML menu option is visible only when you open an XML file in the Visual Studio editor. Figure 5-14 shows the schemas available by default. Create Barcode In C#.NET Using Barcode drawer for .NET Control to generate, create Barcode image in Visual Studio .NET applications. www.OnBarcode.comGenerating Code 11 In Visual C# Using Barcode creation for .NET framework Control to generate, create USD8 image in VS .NET applications. www.OnBarcode.comCHAPTER 5 VA LIDATIN G XML DOCUMEN TS
Drawing Code39 In Java Using Barcode encoder for Java Control to generate, create ANSI/AIM Code 39 image in Java applications. www.OnBarcode.comCode 3 Of 9 Maker In None Using Barcode printer for Font Control to generate, create Code 39 Full ASCII image in Font applications. www.OnBarcode.comFigure 5-14. Schema set of Visual Studio You can add or remove schemas from the cache by clicking the Add or Remove buttons, respectively. Once you ve added a particular schema, you can use it while writing an XML document by selecting the Use this schema option of the schema set dialog (see Figure 5-15). GTIN - 12 Printer In Objective-C Using Barcode creation for iPhone Control to generate, create UPCA image in iPhone applications. www.OnBarcode.comMake UPC Code In .NET Framework Using Barcode creator for Reporting Service Control to generate, create UPC Symbol image in Reporting Service applications. www.OnBarcode.comFigure 5-15. Using a schema from the schema set
Print Barcode In Java Using Barcode creation for BIRT Control to generate, create Barcode image in Eclipse BIRT applications. www.OnBarcode.comUSS Code 39 Creator In Objective-C Using Barcode encoder for iPhone Control to generate, create USS Code 39 image in iPhone applications. www.OnBarcode.comUsing the XmlReader Class to Validate XML Documents
2D Barcode Encoder In VS .NET Using Barcode creator for ASP.NET Control to generate, create Matrix image in ASP.NET applications. www.OnBarcode.comCode 128 Code Set A Scanner In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comThe XmlReader class provides you with a way to validate XML documents by using its Create() method, which accepts the URL of the XML document and an instance of the XmlReaderSettings class. The XmlReaderSettings class configures the XmlReader class and can be used to indicate your intention of validating XML documents. You can also wire up an event handler to receive notification about validation errors. The XmlReader instance returned by the Create() method can be used to read the XML document in the same way as you learned in 3. To illustrate how to use XmlReader to validate XML documents, you will develop an application like the one shown in Figure 5-16. Recognize USS Code 128 In C# Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comPainting UPCA In Java Using Barcode generation for Java Control to generate, create GS1 - 12 image in Java applications. www.OnBarcode.comCH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS
Barcode Decoder In Java Using Barcode decoder for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comCreate Data Matrix ECC200 In Objective-C Using Barcode encoder for iPhone Control to generate, create ECC200 image in iPhone applications. www.OnBarcode.comFigure 5-16. Application for validating an XML document by using the XmlReader class The application consists of two text boxes for accepting the XML document filename and the DTD or schema filename, respectively. The radio buttons indicate whether you are validating against a DTD or schema. Clicking the Validate button validates the document. Any errors encountered during the validation process are indicated via a message box. Listing 5-15 shows the complete code of the application. Listing 5-15. Validating an XML Document by Using XmlReader private void button1_Click(object sender, EventArgs e) { XmlReaderSettings settings = new XmlReaderSettings(); if(radioButton1.Checked) { settings.ProhibitDtd = false; settings.ValidationType = ValidationType.DTD; } else { settings.Schemas.Add("", textBox2.Text); settings.ValidationType=ValidationType.Schema; } settings.ValidationEventHandler += new ValidationEventHandler(OnValidationError); XmlReader reader = XmlReader.Create(textBox1.Text, settings); while (reader.Read()) { //you can put code here //that reads and processes //the document } CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
reader.Close(); MessageBox.Show("Validation over"); } If the XML document is to be validated against a DTD (as indicated by the radio buttons), the ProhibitDtd property of the XmlReaderSettings class is set to false. The ProhibitDtd property decides whether validation against a DTD is allowed. By default this property is true. If the document is to be validated against an XSD schema, the schema is added to the Schemas collection, which can accept an in-memory schema in the form of an XmlSchema class or a file path. The Add() method of the schemas collection used by our code accepts the target namespace and schema file path. The ValidationType property indicates whether the XmlReader should perform validation and whether to use a DTD or a schema. The ValidationType property is an enumeration of type ValidationType and has five possible values, as listed in Table 5-3.
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