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Listing 4-17. Saving the Document private void button5_Click(object sender, EventArgs e) { doc.Save(Application.StartupPath + @"\employees.xml"); }
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Summary
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In this chapter, you learned what XPath is and how to use XPath expressions in the .NET Framework. We covered in detail the XPathNavigator class, which represents the XPath data model of the .NET Framework. The XPathNavigator class can be constructed from either of the XPathDocument or XmlDocument classes. The XPathNavigator returned from XPathDocument is read-only, whereas that returned from XmlDocument is editable. You also learned how to select nodes from the XML document by using XPath expressions in string form as well as in compiled form.
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Validating XML Documents
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n s 2, 3, and 4, you learned how to read and write XML documents, though we always assumed that the XML structure (tag names, attribute names, nesting, and so on) contained in the source XML document was correct. However, in many real-world cases this assumption may not be true. For example, a purchase order application might be accepting orders from various customers in XML format. What is the guarantee that each submitted order adheres to the agreed-on XML structure What if somebody deviates from the agreed-on structure This is where XML schemas come into the picture. XML schemas describe the structure of an XML document; to use an analogy, they serve the same purpose as database schemas. With the help of schemas, you can do two important things: You can create XML documents based on the schema. You can validate XML documents against the schema. In this chapter, you are going to learn about the following: Various ways to define the structure of an XML document What XML schemas are How to create schemas How to validate XML documents against schemas How to create schemas programmatically by using the Schema Object Model (SOM)
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Providing Structure for XML Documents
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As mentioned previously, XML schemas define the structure of XML documents. In other words, they provide a template for creating and validating XML documents. However, a schema is not the only way to provide structure for an XML document. The .NET Framework supports three ways of defining XML structure: Document Type Definitions (DTDs) XML Data Reduced (XDR) schemas XML Schema Definition Language (XSD) schemas
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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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Document Type Definitions (DTDs)
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DTDs are an older way of representing XML structure, but they are still in use. They are a W3C standard, and a considerable number of XML documents depend on them for validation. A DTD defines the overall structure of an XML document in terms of acceptable tag names, acceptable attribute names, and so on. An XML document author uses the DTD while creating a document. The same DTD can be used while validating the document also. Though DTDs are one of the common ways to define XML structure, they suffer from many disadvantages: They use non-XML syntax. They are difficult to create as well as to understand. You need to specifically learn the DTD syntax. They are not extensible. They do not support data types. They do not support namespaces.
XML Data Reduced (XDR) Schemas
While the XSD schema proposal was under consideration, Microsoft went ahead and created its implementation, called the XML Data Reduced, or XDR, schema specification. The XDR schema specification closely matches the XSD schema specification. For the sake of backward compatibility, Microsoft retained support for XDR schemas in the .NET Framework. If you are creating a new schema for your XML documents, you should use the XSD schema specification instead of XDR.
XML Schema Definition Language (XSD) Schemas
XSD schemas represent the most recent effort to provide standardization for defining XML structures. The XSD schema specification is a W3C recommendation. One of the key benefits of XSD schemas is that they support data types. They are XML documents themselves and overcome most of the limitations of DTDs. If you are building new schemas for your XML documents, you should create them by using XSD instead of the DTD or XDR standards.
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