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The .NET Framework supports the XML DOM but not SAX. The XML DOM is the classic way to process XML documents, but it also turns out to be ineffective for certain classes of documents mostly very large and volatile documents. The SAX model was developed to provide an alternative approach. The idea behind SAX is great; the actual programming model is much less ideal. SAX uses the push model, whereas a pull model is certainly more effective and flexible. The .NET Framework provides a third parsing model based on the concept of the reader. The reader is a kind of read-only, forward-only cursor that doesn't cache anything it just reads as quickly as possible. Programmers need classes that implement the XML DOM because the XML DOM is a recognized standard and because it is useful in a number of realistic scenarios. However, XML DOM can't be the only API available to work with XML documents. A lower level set of tools is needed. The .NET reader is just this. In fact, the XML DOM implementation in the .NET Framework is built using readers.

An XML document is primarily a repository of information and as such must be searchable. But how XPath was the first answer to the demand for a query tool to extract node-sets out of XML documents. But more powerful tools are needed. Today, XPath 2.0 is on the way, with XQuery 1.0 running close behind. XPath as we know it today, and as supported by the .NET Framework, is a language for addressing parts of an XML document. XPath 2.0 presents itself as an expression language for processing sequences of text. It also comes with built-in support for querying XML documents. But what's the difference between addressing and querying And between XPath and XQuery I think that the difference between addressing and querying can be summarized by resorting to a SQL metaphor. A simple SELECT statement with a WHERE clause addresses a subset of rows; a more complex SELECT statement that includes UNION, GROUP BY, INNER JOIN, and temporary tables does much more and actually performs a query. XPath 1.0 addresses parts of the documents; XQuery performs complex queries and supports more data types. From a syntax point of view, XPath 2.0 is a subset of XQuery but with a number of key features already included. Stepping from XPath 1.0 to XPath 2.0 positions you nicely for a further jump to XQuery when it becomes a W3C recommendation. A good reference for clearing up any confusion you might have about XPath and XQuery is the following: http://www.xml.com/pub/a/2002/03/20/xpath2.html.

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You can apply multiple filters to a list by filtering on more than one column. For example, if you want to see all the rows where Revenue is greater than or equal to $50,000 and State/Prov equals Alaska, you d apply a filter to both the Revenue column and the State column.

Some programmers believe that .NET Remoting is even harder to set up than DCOM. They point out that DCOM, at least, has a tool (dcomcnfg.exe) to help with the setup and configuration of remote components; .NET Remoting has no such tool (although the Control Panel applet called the .NET Framework Configuration tool [mscorcfg.msc] provides a minimal amount of configuration support). My personal opinion, however, is that the tasks required to set up a .NET Remoting application are far simpler to understand than the equivalent DCOM tasks.

WordArt can be an effective way to call attention to text in a brochure or newsletter. WordArt is text that is formatted to look like a picture. Exercise caution when using this feature. If you use it too frequently, it loses effectiveness and overwhelms the reader. And, if you use it incorrectly, it will make your document appear amateurish. To insert WordArt, position your cursor where you want it to appear in your document. Then click Insert Picture WordArt. In the WordArt Gallery, shown in Figure 3-19, select a style and click OK. In the Edit WordArt Text dialog box, shown in Figure 3-20, specify the font, font size, and bold and/or italics. Then type the word or phrase and click OK. Word gives you a wide variety of options for formatting WordArt. When you click the WordArt, the WordArt toolbar appears. You can edit the text by clicking the Edit Text button. The WordArt Gallery button lets you specify a different style for the WordArt, or you can click the WordArt Shape button to fit the WordArt to a different shape.

Aware of the ubiquity of HTTP, which allows you to legitimately penetrate any system through the always open port 80, at a certain point users began asking more and more for distributed applications capable of interconnecting and interoperating with any sort of remote system For a time, the most natural response to such a demand seemed to be taking the official Windows Component Object Model (COM) and attaching a logical wire to both ends DCOM became the network extension of COM, thus building a new infrastructure on the same successful component technology Seamless integration, a short learning curve, and a concrete possibility of retaining existing investments in COM-based applications and tools were understandably the most intriguing benefits of DCOM DCOM works as a wrapper for COM components.

Tip To decide whether to use AND or OR in a custom filter, ask yourself this question: in a single row

DCOM takes care of all that boring stuff about low-level network protocols and leaves you free to concentrate your efforts on the bread and butter of your business: planning and realizing great and effective solutions for customers DCOM is a binary protocol that has in its favor a theoretically excellent measure of performance, especially when compared to text-based interactions such as those taking place over HTTP and the Internet DCOM applications are fundamentally locationindependent, as the protocol infrastructure covers the physical distance between users in the way it finds best For example, DCOM automatically creates a pair of proxy/stub modules for any interprocess and intermachine communication and resolves the call within the boundary of the current process, whenever this is possible and plausible.

of data, do I want to see the row only if it meets both criteria (AND), or do I want to see the row if it meets either criteria (OR)

So where are the jarring notes with DCOM DCOM Shortcomings In many Internet scenarios, the level of connectivity allowed between a client and a server is subject to a variety of restrictions For example, on its way to the remote server component, a client component might run across a proxy server that filters and controls outbound network traffic As a result, the proxy might prevent the client from properly interacting with the object of its software desire Furthermore, a firewall might filter any incoming Internet requests to protect the server components from any unauthorized contact A firewall normally defines the combination of network ports, packets, and protocols that is acceptable for the safety and the health of the network environment running behind it.

The ultimate effect of such restrictions is that a DCOM client and a server can set up and carry out a conversation only through a quite narrow set of protocol and port combinations When opening a port and sending out the packets that constitute a method request, DCOM dynamically selects a network port in the range 1024 through 65,535 Unfortunately, system administrators normally prohibit inbound Internet traffic from passing through these ports and penetrating into intranet microcosms Using DCOM over the Internet is not particularly reliable or, at least, not as reliable as it is in intranet scenarios The fact that DCOM can use such a wide range of ports 424.

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