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When creating XML using the DOM, everything must be done within the context of a parent document. This document-centric approach to creating XML results in code that is hard to read, write, and debug. Within LINQ to XML, elements and attributes have been granted first-class status. They re standalone values that can be created outside the context of a document or parent element. This allows programmers to work with XML in a much more natural way. Rather than going through factory methods to create elements and attributes, they can be created using the compositional constructors offered by the XElement and XAttribute class. The result is code that is much more readable and understandable. In addition, it is easier to create methods that accept and return elements and attributes, since they no longer have to be constructed within the context of their parent document. Although documents have lost their elite status within LINQ to XML, they still have their place. When creating full XML documents that have XML declarations, document type definitions, and XML processing instructions, LINQ to XML offers the XDocument class. As we work through the rest of this chapter, you ll begin to see the benefits of working within a context-free API. We know you re excited to see more key concepts, so now let s move on to simplified names.

visitor could, for example, enter an order ID and receive a list of items in that order. An ASP saved from Access does not include any ability to select specific records.

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Microsoft s latest answer to software development, Visual Studio .NET, is an editor and project manager that lets you create both Windows desktop applications using one of several languages and Web applications using ASP.NET. .NET allows you to create applications using the programming language of your choice, including Visual Basic .NET, Visual C++ .NET, Visual C# .NET, or Visual J# .NET. No matter which programming language you choose, the compiled version of your program shares the same runtime library with all other languages. When you build a Web application, ASP.NET lets you use any of the available programming languages to generate HTML forms and ASP pages to implement your application. Visual Studio uses essentially the same user interface as the Visual Basic editor supplied with Access 2003. In addition, Visual Studio provides a WYSIWYG HTML editor, ActiveX controls that generate HTML whenever you save a page that contains them, an assortment of database wizards and design tools, and an interactive debugger for both ASP.NET and scripts that run on the browser. ASP.NET also lets you choose the language that you want to use 976

Publishing Data on the Web behind your Web forms, including Visual Basic. Yet, despite all these aids, Visual Studio remains at heart a programmer s environment. If you re not comfortable working directly with HTML code, Visual Basic programming, and ActiveX interfaces, this probably isn t the program for you. Otherwise, rest assured that anything you can do in code, you can do in Visual Studio .NET.

Access 2000 introduced a new feature, data access pages, that lets you design a special type of HTML form page that can navigate, filter, and update data in your database. The architecture to support data access pages has many components that are similar to those for Active Server Pages shown previously in Figure 25-6, but with one major difference. All the database requests originate on the client side of the Web connection, as shown in Figure 25-7. If you re using Microsoft SQL Server to store the data, the Database Management System component can execute on the server side of the network.

One of the most confusing aspects of XML is all the XML names, XML namespaces, and namespace prefixes. When creating elements with the DOM, developers have several overloaded factory methods that allow them to include details of the fully expanded name of an element. How the DOM figures out the name, namespace, and prefix is confusing and complicates the API unnecessarily. Within LINQ to XML, XML names have been greatly simplified. Rather than having to worry about local names, qualified names, namespaces, and namespace prefixes, we can focus on a single fully expanded name. The XName class represents a fully expanded name, which includes the namespace and local name for the elements. When a namespace is included as part of an XName, it takes the following form: {http://schemas.xyxcorp.com/}localname. In addition to simplifying the process of creating elements that use namespaces, LINQ to XML also makes it much easier to query an XML tree for elements that have

Web Browser Active Server Page (ASP)

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ActiveX Data Objects (ADO)

a namespace specified. Let s look at the code for querying the following RSS feed (which has namespaces), shown in listing 9.5.

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Open Database Connectivity (ODBC)

Database Mgmt System (DBMS) TCP/IP Network (File Sharing)

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