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XSLT 2.0 Web Development [Paperback]

Dmitry Kirsanov
4.2 out of 5 stars  See all reviews (6 customer reviews)
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Book Description

March 25 2004 0131406353 978-0131406353 1
This is a practical book describing the entire process of planning, implementing, and maintaining a Web site as an XML-based information system. It covers all stages of an XML Web site project, including: -developing a domain-specific schema, -preparing and validating source documents (both authoring in XML and converting from other formats are covered), -setting up XSLT transformations for automatic generation of HTML, graphics, and other components of the site, -testing and maintenance of the system. Ideal for working Web developers new to XML but eager to learn and leverage its benefits. Web developers understand the power of XML but often are hesitant to deploy it for fear of a steep learning curve. Kirsanov simplifies XML and XSLT and boils it down to just those elements they need to become immediately effective. The main technologies covered in the book are: XML, XSLT 2.0 and XPath 2.0, Schematron, and Cocoon. The book uses many examples of code and markup; also, a full-scale sample site is described throughout the book, with complete listings for page sources, stylesheet, and schema.

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From the Inside Flap

IntroductionWhy this book is needed

”I am left with the feeling that all of the sites I have created are 50% elegance, and 50% nasty kludge.”

This quote from a recent Slashdot discussion on PHP development resonated with the audience. Indeed, as many would attest, a web site usually starts simple but quickly grows into a complex, convoluted mess — where you are afraid of making a change for fear of breaking something else.

Why should a web site so quickly become a nightmare of unmaintainable code, visual and semantic inconsistencies, and outright errors embarrassingly visible to the whole world? Many reasons could be quoted, from limitations specific to the particular web development platforms (such as PHP, ASP, or Perl) to fundamental drawbacks of the ”web site as an application” paradigm.

This book is devoted to one very important way in which the majority of today’s web sites are broken — and, of course, to the technology which (if correctly applied) can mend this breakage. The problem I’m speaking about is the lack of a consistently semantic and media-independent representation of web site content; the technology that can help you solve this problem is XML; and the key to applying it in web development is XSLT transformations.

Say what you mean. XML is no panacea. It won’t magically make your sites self-maintaining or error-proof. But it will give you a critical advantage: Just as a good programming language allows you to freely express your algorithms, XML makes it possible to actually say what you mean in content markup.

The word content is the key. XML is actually more important for webdevelopment than any programming language — simply because youcan have a web site without a dynamic engine of any kind, but therecannot exist a web site without content.

In fact, a lot of the approaches in this book apply not only to web sites but to any XML-based document workflows, such as books or technical documentation. XML stimulates thinking about content as such, abstracting it not only from its presentation but from any processing requirements as well.

What you will find in this book

This is not a general XML book; it is a book on one specific application of XML. What you’ll find here is as much XML and XSLT as is necessary for a sequence of very practical tasks:

  • structuring your web site content into cleanly separated semantic layers;
  • developing a custom XML markup vocabulary for each layer;
  • automatically validating both markup and structure of content;
  • transforming content from source XML to browser-ready HTML using XSLT (optionally with generation of images and other non-HTML objects); and
  • integrating the content markup and transformation system with existing web development frameworks and other software.

Building the backbone. The point of using XML in web design is to separate content from presentation; the above items cover the complete transition from the former to the latter. Simply put, we focus on developing the best source markup for your content and programming the most efficient transformation into your chosen presentation style.

An XML web site may include other components, such as a database, a dynamic engine, or a maintenance back-end. There is a wide range of auxiliary tools and architectures compatible with an XML-based web site. Many of them are mentioned in this book, and a few are explored in detail (notably Cocoon, Chapter 7). However, the content-to-presentation assembly line is the backbone of any XML web site and our main focus of attention in this book.

Usability and portability. In a web development context, the term usability normally refers to how easy to use a web site is for a visitor. In this book, however, I would like to redefine this term by focusing on a different aspect of usability that is too often ignored — usability of a web site for its developers, authors, editors, and maintainers. With the Web growing more and more collaborative, this aspect is becoming critical.

Using semantic XML for content markup is already a big step toward liberating web authors from worrying about things they don’t need to worry about. But semantic XML is only an idea; how you implement this idea will seriously affect the ”authorability” and ”maintainability” of your site. This is where this book, with its pervasive ideas of simplification, abbreviation, and readability, might be useful.

Another important theme of the book is portability. Again, this term usually describes a web site’s viewability and functionality across browsers and platforms. It’s not less important, however, that before a web site gets to your browser, it must be developed and authored — often in different environments and on different platforms. We touch on this server-side aspect of portability with regard to the XML/XSLTworkflow.

Who this book is for

Everyone interested in web development or in practical XML/XSLT should find this book interesting. It will be especially useful for web designers, web developers, project managers, as well as webmasters and web site administrators. Whether you are building a modest personal home page or a large dynamic site, learning the XML way of doing things will transform your outlook even if you don’t plan to use (all of ) this book’s techniques.

You need to have a basic knowledge of XML to read and enjoy this book. For most chapters, understanding of XML syntax and common XML-related terms will be enough, but for Chapter 5 you will want to know some XSLT and especially XPath. Expert knowledge of HTML is neither required nor offered. Some familiarity with web development concepts and jargon might be useful but is not necessary.

How this book is organized

Perhaps you’ve already thumbed through the book, so you might have noticed that it breaks into three main parts. The first part is composed mostly of text and diagrams; the second features lots of example code; the last displays a number of screenshots. This sequence metaphorically reflects the path that we’ll follow from manipulating abstract notions, to writing practical markup and code, to launching and maintaining a final working web site.

Chapter 1 is mostly theoretical; we’ll spend some time discussing the basic premises of XML and its applicability to web development. It is recommended that you read this chapter carefully, for its concepts and terminology are used throughout the book. No real harm will be done, however, if you poke into the book’s code examples first and return to Chapter 1 later.

The topics of this chapter include the principles behind using XML with web sites, an overview of relevant XML standards, and a classification of the possible ways to set up an XML web site. Special attention is paid to the dynamic web sites and the approaches to combining XML processing with a dynamic engine.

Chapter 2 is dedicated to the foundation of an XML web site — its source definition. This includes schemas for all document types used by the web site’s XML source plus all the rules and regulations that may be impossible to express in a schema language but that the source must satisfy in order to smoothly transform into a correct web site.

In this chapter, we’ll look at different schema languages and discuss the implementation options for those parts of the source definition that a schema cannot handle. We will also examine the common generic markup constructs, the best approaches to their schematization, and a number of corresponding pitfalls. For instance, in this chapter you’ll find insights into the eternal ”child elements vs. attributes” dilemma.

Chapter 3 is the practical complement to the previous chapter. Here, we’ll use the approaches of Chapter 2 to mark up some real web site source documents. Most common elements of web pages, such as text blocks, headings, links, and images, are considered. In most cases, existing standardized vocabularies that you can borrow from are mentioned.

Some important concepts of the book, such as abbreviating addresses, are introduced in this chapter. This is also the chapter where markup examples start appearing in large numbers, so if you prefer to learn by looking at examples, you might want to start your reading from this chapter. The last section of the chapter presents summary examples of a page document, a master document, and a Schematron schema that validates both types of documents.

Chapter 4 is the first of the two XSLT chapters. It is an introduction aimed at a developer who has had some experience with XSLT 1.0. Here, we’ll discuss some of the new stuff that is being introduced in XSLT 2.0 and XPath 2.0 as well as the existing XSLT extensions. A detailed analysis is devoted to the important issue of adapting traditional algorithms to XSLT, which is a functional language without an assignment operator.

Chapter 5 is the core of the book — the practical XSLT chapter and the largest of all of them. Lots of XSLT code examples show all aspects of an XML-to-HTML transformation, from setting up the environment and building the page layout to low-level text processing. We’ll also revisit our Schematron schema to add some exciting new checks made possible by XPath 2.0.

This chapter not only uses but extends XSLT. We’ll see how a few simple Java classes may drastically advance the capabilities of an XSLT stylesheet. These extensions are used in Chapter 5 for all kinds of tasks, from generating bitmap images via SVG to batch processing all page documents of a site. Again, a section with complete listings of the stylesheet and related bits of code summarizes this chapter.

Chapter 6 is where the screenshots are. It is devoted to all kinds of software that will help you run your XML web site after thecore validation and transformation components are ready. The focus here is not on specioc programs but on classifying the functionality of XML software and the approaches to various practical problems.

Sections of this chapter discuss the existing XML authoring paradigms and the principles of converting other formats into XML. Also reviewed are various tools and utilities for handling XML, XSLT, and XPath. The last section explores the use of buildtools, such as the make utility, in XML web site projects.

Chapter 7 is concerned with integrating the XML/XSLT system into a web server setup. We’ll briefly discuss using an XSLT processor as a servlet, but the bulk of this chapter is devoted to Apache Cocoon, which crowns the chapter and the book. After learning the principles of building Cocoon web sites, we’ll revisit our sample web site from previous chapters to see what it takes to adapt it to run under Cocoon.

Typographic conventions

Designing your own book is a mindbending experience (something that songwriters who author both music and lyrics would probably agree with). In my book, I tried to make the text look rich but consistent, pleasantly dense but varied. Some of the solutions that I came up with may deserve a few words.

Running in from aside. Three levels of numbered headings are used within each chapter. In addition, unnumbered bold run-in headings are often used (as in this paragraph) to break the text into even smaller, manageable pieces.

Semantically, the run-ins are closer to margin notes than headings; usually their goal is not to state the subject but to provide a remark, an aside, a metaphor related to the topic of discussion. Hopefully these run-in headings are memorable enough to serve as landmarks facilitating navigation.

Small but not least. Some paragraphs, with or without run-in headings, are set in a smaller type. They present material that may be skipped in the first reading without any damage to understanding. You can treat the smallertype fragments as extended footnotes or sidebars.

Cross-references. Bold gray numbers (such as 3.9) refer to numbered sections of the book. The running headers and footers should make it easy to find the referenced sections; however, for references that jump especially far, page numbers are also provided.

Syntax coloring without colors. Unlike most computer books with code listings, this one makes use of a concept that has long been commonplace in text editors: syntax coloring. Of course, a black-andwhite book page is not really capable of color (except for shades of gray), but instead it can freely use font faces that usually look nicer on paper than on a computer screen. Thus, I have attempted to make code in the book at least as readable as it is in a good text editor by consistently ”coloring” syntactic constructions with different font faces.

Essential URLs.The rationale is simple: Forward slashes are standard on Unix and in URLs, and most Windows tools understand both kinds of slashes anyway.

Notes on terminology

The terminology used in the book is basically standard. Sometimes I simplify the accepted terminology in order to make it more accessible, or I use my own terms instead of those used in authoritative sources; all such cases are noted. Some important terms that may appear confusing or are often misunderstood are commented on below.

Element type, element, or tag? When speaking of XML, manypeople fail to differentiate between an element and an element type. Sometimes, a tag is also confused with an element. Note that an element cannot have a name — only an element type can; still, we can refer to an element by its element type name if we identify which of the elements of this type is in question. In the XSLT context, an element from the XSLT namespace (e.g., xsl:template) is often called an instruction.

Stylesheet or transformation? The word stylesheet may be misleading when applied to an XSLT program that transforms one XML document into another; the word transformation would be more appropriate. (Note that xsl:stylesheet and xsl:transform are both acceptable as the root element of an XSLT stylesheet.) Still, backed by tradition, I mostly use ”stylesheet” or, sometimes, ”transformation stylesheet” when referring to the XSLT component of a web site setup.

Stylesheet or style sheet? To avoid confusion with XSLT stylesheets, CSS style sheets are always spelled thus; this is conformant with both XSLT and CSS specifications.

Document, instance, page, or file? Document is a generic term, but I use it only to refer to XML documents, while HTML documents are usually called pages. Instance is another term often used in XML (it refers to a document being an instance of its document type), but I will stick to “documents” as more familiar. Neither “document” nor “instance” are synonymous with file; a document is not necessarily stored in a file at all. Therefore, “file” is used only when real files, handled by the operating system, are involved.

Document element or root element? The XSLT specification uses the term document element with the meaning of root element. I use the latter term as more descriptive, even though it may be slightly confusing from an XSLT viewpoint because the “root node” of XPath (/) is the parent of the node corresponding to the “root element” (e.g., /page).

XML Schema or XSDL? XML Schema is the W3C recommendation for a schema language. Unfortunately, its name is way too generic for its own good. Even the capital S in “Schema” cannot prevent confusion when you have to speak about XML Schema among other schema languages for XML, and especially when you refer to specific schemas written in that language. So, in conformance with other books in this series, I use the abbreviation XSDL (XML Schema Definition Language) to refer to the language itself and XSDL schemas to refer to specific schema definitions.

Yet another abbreviation you may have seen used for the same language is WXS, standing for W3C XML Schema.

URI or URL? This one may confuse even experts at times. URI is a more general term than URL, but the difference between them — i.e., those URIs that are not URLs — is so insignificant that for practical purposes, these terms are interchangeable. See RFC 2396 for more details.

HTML or XHTML? Since this book views HTML mostly as a result of an XSLT transformation, what I mean when speaking of HTML may actually be either HTML or XHTML (any versions). With XSLT, you can output both formats, and modern browsers do not have any problems with either. When there’s a meaningful distinction between HTML and XHTML, this is noted.

“Data is” or “data are”? Formally, data is the plural of datum. In modern English, however, using “data” as singular is more common, as evidenced by statistics reported by Internet search engines. In this book “data” is used as singular.

How this book was created

“Practice what you preach.” “Eat your own dogfood.” One way or the other, this book itself uses many of the techniques it describes.

The text of the book was written directly in XML using a custom schema inspired by HTML, DocBook, and Charles F. Goldfarb’s DTD that is used by many books in this Definitive XML Series. An XSLT transformation stylesheet written by Alina Kirsanova translated the source into XSL-FO and performed all necessary processing, such as importing code examples (stored separately), special character substitutions (5.4.2.2), compiling the Index and TOC, and generating cross-references.

The design for the book was also created by me, with elements borrowed from the other books in the series that we worked on using the same XML/XSLT/XSL-FO technology. The final rendering of XSL-FO into PDF was done by XEP from RenderX. Code examples (in a total of 11 different formats and XML vocabularies) were parsed by XEmacs + PSGML (6.1.1.2) with custom syntax coloring regexps and then saved into XHTML using htmlize.el by Hrvoje Niksic. The resulting files were then translated by a simple stylesheet into a vocabulary understood by the book’s main transformation stylesheet.

From the Back Cover

“I’ve worked with Dmitry on many projects. He is both a designer (artist) and a developer (programmer), so his book genuinely speaks to both audiences.”

—Charles F. Goldfarb

Leverage the incredible power of XSLT 2.0 to create sites that are easy to build, maintain, and extend!

This book teaches you exactly how to build state-of-the-art web sites with XSLT 2.0 and XPath 2.0. XML developer and web designer Dmitry Kirsanov drills down to real development challenges and specific tools and techniques for solving them.

You’ll learn from a hands-on project that gives you insights you just won’t find anywhere else. Kirsanov covers the entire project lifecycle: schema creation, validation, transformation, testing, and maintenance… offering outstanding code and markup examples every step of the way.

  • Explore new XSLT 2.0/XPath 2.0 standards from a web developer’s point of view
  • Develop rock-solid, high-performance domain-specific schemas
  • Create and convert source documents for effective XML processing
  • Set up XSLT transformations to automatically generate HTML, graphics, and other site components
  • Build your dynamic web site on the solid foundation of the Cocoon framework
  • Use Schematron to validate XML and streamline processing
  • Study complete printed and downloadable page sources, stylesheets, and schemas

XSLT 2.0 Web Development is an indispensable resource for…

  • Professional web developers
  • Project managers who want to streamline site development and maintenance
  • Graphic designers who need more flexible ways to present structured information
  • Content management specialists using XML documentation/publishing systems

Fully tested and implemented examples are available at authors.phptr.com/kirsanov andwww.kirsanov.com/xsltwd


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Customer Reviews

4.2 out of 5 stars
4.2 out of 5 stars
Most helpful customer reviews
Format:Paperback
XSLT 2.0 Web Development" by Dmitry Kirsanov, teaches a system of transforming semantically structured content into browser-ready HTML, including the proper separation of content from presentation, structuring the content into "cleanly separated semantic layers", developing a XML vocabulary for each layer, validating the XML and content structure, using XSLT to transform the XML content to HTML, and integrating the transformation system with web development frameworks and development tools.
As described in the introduction, the author suggests readers should have a basic understanding of XML syntax and terms, as well as "know some XSLT and especially XPath". Before reading this book, this reviwer was comfortable reading, editing and creating XML documents, but I couldn't (and still can't) write an XML DTD. Also, the only idea I had about XSLT was that it's used to transform XML documents into HTML. That's it. With those basic introductory understandings, I had no problems following the well-structured and well-explained lessons throughout the book, as well as applying those lessons while developing a real-life web site.
This 406 page book consists of seven chapters containing plenty of well-organized and well-used text and diagrams, example code showing "all aspects of an XML-to-HTML transformation", and plenty of screenshots. The contents also include a discussion of the basic premises of XML, explanations and examples of XML source definitions including schema and regulations, a Schematron schema for document validation, XSLT extensions including new additions to XSLT 2.0 and XPath 2.
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4.0 out of 5 stars A guide inside the new xml world ! June 23 2004
Format:Paperback
This book has been a very interesting reading for me since it covers a lot of topics in a different way than usual. It's not a book for beginners, it does not teach you how to use XSLT from scratch neither teaches you how to build a web application if you have never done one. This book serve for mid-expert web application designer and builder in understanding the beauty,
and the need, to learn xml and xslt.
By reading this book you learn to appreciate the importance of xml and how you can effectively use it in your web application. The book requires a basic knowledge of xml and xslt, but if you have already use it, even not much,
you will learn that you cannot totally miss the knowledge of this important topic.
While reading this book my feeling has been to run on a store and
buy more dedicated books of all the topics that are discussed throughout this book. Definitely what most have impressed me are three different topics well covered on this book: Schematron, XSLT java extension and Cocoon. I feel more confident
and sure that I need to get e dapper understanding of these three topics, and this book gave me the right flavour for them. I recommend this book for both developers but most for designers that need to migrate from traditional web application
to a complete xml and xslt web applications.
Max Pellizzaro
[...]
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5.0 out of 5 stars Great book, ignore the 2.0 April 27 2004
Format:Paperback
To get the most out of this book you need to ignore the 2.0 in the title. The book is only incidentally about XSLT 2.0, and it does a great job covering modern XSLT web development. I'm actually serious in my advice, if you just concentrate on the 2.0 portion of the book you will be disappointed. You need to assess the value of the book as a whole. And that value is great. Primarily because of chapters like the first chapter which dig into how XSLT can be used to revolutionize the generation of static and dynamic websites through XML data abstraction and the use of XSLT stylesheets.
A couple of years back XSLT was the great hope for replacing JSP with an abstract interface that would generate code for both HTML and WAP. That never materialized, mainly because server side technologies were too slow and client side XSLT wasn't universally supported. In hindsight it's obvious that this JSP replacement mindset was in error. This book is a complete re-assesment of XSLT in the web development context and provides a number of options and architectures to address different performance and abstraction concerns.
If you would consider yourself a 'web designer' I don't think this book is for you. It has too much about XML schema design and not enough about the mechanics of XSLT conversion. This book is better suited to senior developers and architects who want a novel and intelligent approach to construction of static and dynamic web sites, using XML and XSLT.
For XSLT advocates who feel that their favorite technology was miscast and sent out to pasture years early, this book is for you. Let's hope Addison-Wesley marketing can find that sweet spot to get this book out there. The author has some great ideas and it would be wonderful to see them popularized.
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