The next five years will see a revolution in computing. Users will no longer have to work at every computer task as if they had no need or ability to share data with all their other computer tasks, they will not need to act as if the computer is simply a replacement for paper, nor will theyhave to appease computers or software programs that seem to be at war with one another. The Standard Generalized Markup Language (SGML) is the technical advance enabling this revolution, and Dr Charles Goldfarb of the IBM Almaden Research Center is its inventor. The SGML Handbook gives the readerDr Goldfarb's thoughts on each clause in this widely adopted international standard, and guides the reader through every detail of SGML. The SGML Handbook includes the up-to-date amended full text of ISO 8879, extensively annotated, cross-referenced, and indexed; a detailed, structured overview of SGML, covering every concept; additional tutorial and reference material; a unique 'push-button access system' that provides hypertextlinks between the standard, annotations, overview, and tutorials. SGML will improve the productivity and competitiveness of all computer users if its sophistication is now harnessed by developers of SGML applications and implementors of SGML systems. These are the people who will find this book an invaluable guide and an authoritative voice.

Although not evident to all, many people have been waiting more than a decade for The SGML FAQ Book by Steve DeRose. It has been "brewing" for a long time, with many hours, months, years of research talking to people, gathering their ideas, listening to their frustrations, applauding their successes. Only Steve with his experience, credentials, wit, and enthusiasm for the subject could have written this book. But it is also a measure of the success and maturity of ISO 8879 and its amazing longevity that allows an "SGMLer" to write such a book. We can now laugh at ourselves, even disclose our mistakes without fear of the other guy. While most would not recognize it, the revolution known as the World Wide Web would not have happened without a non-proprietary, easy, and almost "portable way to create and distribute documents across a widely disparate set of computers, networks, even countries. HTML, an SGML application, enabled this and as a result the world and the SGML community will never be the same. For some the term SGML means order, management, standards, discipline; to others, the term brings images of pain, confusion, complexity, and pitfalls. To all who have engaged in it, the Standard means hard work, good friends, savings in terms of time, money, and effort, a sense of accomplishment and best of all - fun. This book adds immeasurably to all of these. Enjoy the quote from Through Looking by Lewis Carroll as much as we have.

The Wife of Bath's Prologue on CD-ROM is the initial release in The Canterbury Tales on CD-ROM from Cambridge. The disk presents transcriptions, collations and digitized images of all 58 pre-1500 manuscript and print versions of Geoffrey Chaucer's famous poem - an important section of The Canterbury Tales. We provide on a single disk the material which Chaucer scholars have until now had to travel around the world to view in different libraries. The software allows sophisticated searches of all the witnesses of The Wife of Bath's Prologue simultaneously, giving scholars rapid access to a large archive of information of a kind never before realised.

Foreword------------------------------------- SGML is misunderstood and underestimated. I have always wanted to write this book. I am pleased that two people with whom I have had the pleasure to work were finally able to do so. Since I have always been a bit of an evangelist, I feel pride when my "students" become recognized "teachers". In the early years of SGML we struggled to define a language that would bring the information to its rightful place. We succeeded. Then we had to explain these idea to technical adoptors. Again, I think we have succeeded. We have learned much about SGML in the process of implementing it. These experiences must now also be shared, along with comprehensible information on the lan guage itself. The word must move out of the lab and the computer center and reach the business people, the users, the movers and shakers. The next generation will do things with SGML that we can't even imagine yet- it is that versatile.

DSSSL (Document Style Semantics and Specification Language) is an ISO standard (ISO/IEC 10179: 1996) published in the year 1996. DSSSL is a standard of the SGML family (Standard Generalized Markup Language, ISO 8879:1986), whose aim is to establish a processing model for SGML documents. For a good understanding of the SGML standard, many books exist including Author's guide[BryanI988] and The SGML handbook[GoldfarbI990]. A DSSSL document is an SGML document, written with the same rules that guide any SGML document. The structure of a DSSSL document is explained in Chapter 2. DSSSL is based, in part, on scheme, a standard functional programming language. The DSSSL subset of scheme along with the procedures supported by DSSSL are explained in Chapter 3. The DSSSL standard starts with the supposition of a pre-existing SGML document, and offers a series of processes that can be performed on it: • Groves The first process that is performed on an SGML document in DSSSL is always the analysis of the document and the creation of a grove. The DSSSL standard shares many common characteristics with another standard of the SGML family, HyTime (ISO/IEC 10744). These standards were developed in parallel, and their developers designed a common data model, the grove, that would support the processing needs of each standard.

Peter Flynn has been an enthusiastic and skillful contributor in the world of SGML and XML for many years, and it is a pleasure to see him set some of his expertise down in writing as well. The range and power of SGML tools have taken a sharp upward turn: the first step leading to this was that the Web came along with HTML, and showed the whole world that pointy brackets and (at least somewhat) descriptive markup could make a difference. Soon afterward, 'HTML claustrophobia' began to grow and XML came to the rescue. Since XML is fundamentally an elegant subset of SGML that reduces complexity without reducing functionality, the movement to XML is great for SGML too. The massive interest in XML is bringing forth a huge variety of new, faster, more powerful, and cheaper software tools. Peter has caught the cusp of this change and shows in detail how SGML and XML tools fit together into integrated solutions that return value for your investment in structured information.