Perl & LWP --The Library for WWW in Perl (LWP) is a suite of modules that lets your programs fetch and process Web pages. This book shows how to make Web requests, submit forms, and even provide authentication information. Perl & LWP also includes step-by-step examples on how to extract information from HTML using regular expressions, tokens, and trees. This book is a must-have for Perl programmers who want to automate and mine the Web. Sampe Chapter 7, HTML Processing with Tokens, is available online in PDF format.

XML Schema explains the ins and outs of XML Schema foundations. You'll find topics covering everything from different styles for writing schemas to types, datatypes, and facets. Additional discussions on design choices, best practices, and limitations round out this thorough reference. No matter how you intend to use XML Schema--for data structures or document structures, for standalone documents or as part of SOAP transactions, for documentation, validation, or data binding--this book details all the foundations you need. Sample Chapter 12, Creating More Building Blocks Using Object-Oriented Features, and Sample Chapter 14, Documenting Schemas, are available online in PDF format.

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Practical VoIP Using Vocal --While many books describe the theory behind Voice over IP, only this one describes how such a phone system was actually built. This book shows you how to acquire the Vocal (Vovida Open Communication Application Library) source code, install it onto a system, connect phones, and make calls. Because Vocal is open source, you can look under the hood to discover how the system works and how common problems are being worked out in the development environment. Sample Chapter 7, Session Initiation Protocol and Related Protocols, is available online in PDF format.