[This local archive copy mirrored from the canonical site: http://www.gca.org/conf/meta98/xmldev98/index.htm, 1998-08-19. The document has been enhanced with additional links/anchors for referencing. Annotations have been made. Updated 1998-09-25.]

XML Developers' Conference

August 20-21, 1998

Montréal, Canada

August 20
Speaker Title
0900-0915 Jon Bosak, Sun Microsystems Introductory Remarks
0915-1000 David Turner, Microsoft XML Support in Internet Explorer
1000-1030 Ramanathan Guha, Netscape XML Support in Netscape Navigator
1030-1100 BREAK
1100-1130 David Brownell, Sun Microsystems The Sun XML Library
1130-1200 Dave Hollander, Hewlett-Packard XML in the InfoWorks Document Management System
1200-1230 Neel Sundaresan, IBM Almaden Research Center RDF in Java
1230-1400 LUNCH
1400-1445 Lloyd Rutledge, CWI SMIL within Hypermedia Environments
1445-1530 Matthew Fuchs and Murray Maloney, Veo Systems When Documents and Objects Meet: Using Schemata in Software Development
1530-1600 BREAK
1600-1630 Liam Quin and Ian Graham, GroveWare GroveWare Inc. XML Database
1630-1710 Steve Withall XXX - eXpandable XML eXploitation
1710-1730 Ken Holman, OASIS Report on XML Conformance
August 21
Speaker Title
0900-0930 Brian McFadden, Xtenit Filtering XML Documents and Data Sets
0930-1000 Paul Prescod Python: the 100% Buzzword Compliant XML Processing Language
1000-1030 Tim Bray, Textuality Reifying the DPH
1030-1100 BREAK
1100-1145 Rob Brown, InDelv InDelv WYSIWYG XML/XSL editor
1145-1230 Tim Bray, Textuality Construction of the Annotated XML Specification
1230-1400 LUNCH
1400-1445 Peter Murray-Rust, VHG Consulting The Virtual Hyperglossary -- Adding Semantics and Ontology to XML
1445-1530 Kurt D. Fenstermacher Using XML in Knowledge Management
1530-1600 BREAK
1600-1645 Eliot Kimber, Isogen Grove-based XLink Implementations
1645-1730 David Megginson, Megginson Technologies XAF: Using Architectural Forms with XML

Click here for conference registration.

Presentation Abstracts

XML Support in Internet Explorer

By David Turner, Microsoft.

The presentation slides are available online.

XML Support in Netscape Navigator

By Ramanathan Guha, Netscape.

The presentation slides are [will be] available online.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/db.htm]

The Sun XML Library

    David Brownell
    Java Software Division
    Sun Microsystems, Inc.

Sun Microsystems has played a key role in the development of XML. As the creator of the Java™ programming language, Sun also recognizes the complementary benefits of using Java technology with XML for middleware messaging, for online publishing based on structured content, and for other classes of Internet applications. Accordingly, there are a variety of XML-related projects in development at Sun.

This session will discuss one of those projects: a highly modular XML library that has been developed by the Java Software Division of Sun. The XML library is written in the Java programming language and provides support for the latest version (July) of the W3C DOM APIs and for the SAX 1.0 API. The XML package includes:

This presentation discusses the initial version of this library, including its basic performance statistics and extensions to SAX and DOM. Some other XML-related projects at Sun will also be discussed. Developer feedback is solicited, particularly from other Java-oriented XML development projects.


Note:    [September 25, 1998 update.] On September 16, 1998, Sun Microsystems, Inc. released an 'Early Access 1' version of The Sun XML Library. The September 16th version is the the first early access release, "addressed to Java developers who want access to Sun's fast and fully conformant XML library core for their development of extensible, conformant XML-enabled services and applications. That library supports fast parsing of XML documents, including optional validation, and supports an optional in-memory object model tree for manipulating and writing XML structured data. In addition, the core functionality supports an implementation of the W3C DOM APIs and the XML Namespaces proposal. The library is 'core' in the sense that significant XML based applications can be written using only this functionality, and that it is intended that other XML software be layered on top of it. All classes are written exclusively in the Java[tm] language, and accordingly may be used with any JDK 1.1 conformant system, including JDK 1.2 conformant systems. Developers have expressed strong interest in seeing XML enabling technology emerge from Sun because of the key role Sun has played in developing the XML specification and in creating the Java platform. The Java technology's 'portable code' along with XML's 'portable data' are valuable complements in creating truly platform-independent applications. Through the early access release, developers have an unique opportunity to participate in defining and evolving the XML Library." [adapted from the XML Library 'README' and FAQ documents]

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/dmh.htm]

XML in the InfoWorks Document Management System

Abstract for Presentation at XML DevCon
Dave Hollander
XML Architect
Hewlett-Packard Company

Hewlett-Packard is extending their InfoWorks marketing document management system to add formalization to the content creation process by enhancing the documents as XML described objects as chunked data resources for intelligent custom delivery. The goals of this program are the classic write-once/deliver-many goals:

To allow these goals to be achieved, we are enhancing Infoworks to establish a repeatable, predictable and manageable separation between information development processes and information delivery processes. Central to these features are XML encoded chunks of information and templates which are used to create, manage and deliver the information.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/neel.htm]

RDF in Java

Neel Sundaresan, IBM Almaden Research Center
email: neel@almaden.ibm.com

In this presentation we will discuss RDF in Java, a processor for RDF (Resource Description Framework) written in Java. This processor provides facilities for building RDF structures, navigating and querying them, manipulating them, and converting them to their equivalent XML forms. It also has facilities to perform I/O operations on RDF structures.

RDF is a foundation for processing metdata; it provides interoperability between applications that exchange machine-understandable information on the Web. It can be used in a variety of areas including resource discovery for search engines, cataloging for describing contents, content rating, and so on. It is a simple graph language for describing resources and properties associated with resources. The goal of RDF is to provide a mechanism to describe resources and their properties in a domain-independent way. RDF uses XML as one of its encoding syntax, the other two being graphs and tuples. Two W3C groups are working on RDF mechanisms : the RDF syntax and model working group, and the RDF Schema working group.

The current implementation of RDF in Java conforms to the working draft dated 02/16/1998 of the W3C RDF Syntax and Model working group. It performs the recommended abbreviations in the document. The tool is available for free download from the IBM Alphaworks web-site at http://www.alphaworks.ibm.com. The first version of the tool has been downloaded by over 2000 users and has been used to build web document summaries, sitemaps, geneology structures, and Java serialization structures. The processor is being updated to support the latest document dated 06/15/1998 and to provide complete support for RDF schema.

In this presentation we will discuss RDF, the RDF in Java tool and its functionalities, and describe some of the applications that have been built using the tool.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/lloyd.htm]

SMIL within Hypermedia Environments

Lloyd Rutledge, Lynda Hardman, and Dick C. A. Bulterman
CWI (Centrum voor Wiskunde en Informatica)
P.O. Box 94079
1090 GB Amsterdam
The Netherlands
phone: +31 20 592 4127
fax: +31 20 592 4199

SMIL (Synchronized Multimedia Integration Language, pronounced "smile") is a recent W3C recommendation for hypermedia presentations. An XML-compliant, DTD-defined format, SMIL can be roughly characterized as "HTML for interactive multimedia". SMIL version 1.0 was designed for easy integration of anticipated XML-related specifications such as XLink, XPointer and namespaces. Features of SMIL include:

We at CWI were involved in the creation of SMIL and have developed an authoring and playback environment called GRiNS (GRaphical iNterface for SMIL). This has evolved out of our research on adaptive hypermedia with the Amsterdam Hypermedia Model, an extension of the Dexter hypertext model. Features of GRiNS include:

We have also designed Berlage, an automated, complete storage-to-presentation generation environment. Berlage is built entirely from existing public standards and publically available free tools. This work has evolved out of our research on modeling abstract presentation-independent document structure and our research on the style sheet issues that are particular to hypermedia. Components of the Berlage environment include:

This talk presents SMIL, GRiNS and Berlage. An overview of SMIL is given, along with a discussion of its current and anticipated relationship with other XML-related current and developing formats. The work behind developing GRiNS is discussed, along with the XML-related issues that were behind this development. Finally, the Berlage environment is described, with its use of XML- and SGML-related standards.


The CWI SMIL Page. http://www.cwi.nl/SMIL/.

The CWI GRiNS Page. http://www.cwi.nl/SMIL/GRiNS/.

Lloyd Rutledge, Jacco van Ossenbruggen, Lynda Hardman, and Dick C. A. Bulterman, "Practical Application of Existing Hypermedia Standards and Tools", Proceedings of Digital Libraries 98, June 1998.

Note: The presentation slides for "SMIL within Hypermedia Environments" are available in Postscript format [local archive copy].

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/veo.htm]

When Documents and Objects Meet

Using Schemata in Software Development

Matthew Fuchs, PhD

Murray Maloney

Veo Systems, Inc.

What is the value of having a schema language, beyond expressing DTDs in instance syntax? Veo has been developing CBL, a library of XML components for common business transactions to become the basis for electronic commerce. Building something as complex as CBL, and getting it right, requires a tight iterative loop between specifying CBL components on the one hand and testing them in actual software on the other. We needed to drastically reduce the cycle time for each iteration to have a hope of delivering a product within the same millenium we started in. We chose to develop an object-oriented schema language, the Business Interface Description Language (bidl) to do this.

The normal process is for a DTD designer to go about his or her business, and then hand the DTD, with comments and documentation, to the programming staff. The programming staff then looks at this stack of paper or electrons and then starts determining how to implement it. This waterfall methodology is known to fail, especially when hacking into new territory.

The central problem was in conveying intent. XML, we realized, had great facilities for describing how to express information, but very few for actually modeling it. It turns out XML is great for expressing other semantics but has very weak internal semantics. DTD designers have been forced to do their modeling with very primitive tools that completely predate the object revolution and then convey their intentions (such as the semantic relationships among elements) with out-of-band data. By exploiting object-oriented constructs in BIDL (such as inheritance of structure and interface) the DTD designer (or schemographer, as it were) could convey much more of his intent in a succinct (and formal manner). A programmer can look at a bidl instance and know what her code will look like - and call the designer up and ask why? Where the intention is complex, and text is required, bidl has a built in notion of literate programming, so those explanations are never lost.

Veo has brought, side by side, world-class XML talent and world-class programming talent (and a couple who've done both). We've designed leading edge DTDs and world-spanning distributed systems. Now we needed to do both. Developing bidl became an iterative process around the desires of our XML experts and the needs of our (Java) programmers. Constructs in bidl were added because of evident need and their meaning honed in actual use. This process was not without its long walks, discussions and arguments - no one in Veo lacks opinions. But the lessons learned have been significant.

Running the world on XML implies that everyone will receive lots of XML from a variety of domains. In a peer-to-peer world we'll all need applications to handle these messages, and these applications imply lots (and lots)+ of code. For those organizations (such as our own) not yet in the Fortune 100, this is a daunting task. We believe that bidl, and the work processes we have built around it, are key to making this vision possible.

Note: See now "Bringing XML into the World of Objects. Using Schemata in Software Development." By Matthew Fuchs and Murray Maloney [Veo Systems]. Slides from the presentation at XML Developers' Day, August 21, 1998. Alternately, the slides are available from the GCA Web site.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/quin.htm]

GroveWare Inc. XML Database

Liam Quin and Ian Graham

We at GroveWare Inc. have been working on a database/repository for XML documents, built on an object oriented database, and with an Web-based interface.

Information is stored internally in Java objects, using a Schema for simple run time typing information and content validation.

All user interaction is through HTTP, using dynamically generated HTML and forms; DSSSL style sheets are used to format the XML information on the fly (currently with Jade) and to present them as HTML to users.

The first product using this engine is now shipping; we are working on a revised version of the engine for the future.

Note: The presentation slides are now available in HTML and PowerPoint format.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/stevew.htm]

XXX - eXpandable XML eXploitation

By Steve Withall


This presentation describes a number of design ideas for flexible, expandable applications that manipulate and otherwise exploit XML documents. Steve will demonstrate these ideas using a Java 'XML Testbed' application. (Steve intends to publicly release all his source code either at or prior to the conference - including his own parser and XSL engine.)

Expandable Application Structure

Steve divides the application into four parts:

Core XML Processing

Four Java packages provide functions for representing and manipulating XML documents:

XML Parsing Engines

Any supported parser can drive the application, in a similar manner to SAX, but at a higher level. (SAX is, however, a supported 'parser').

Specialised XML Usages

The vanilla application manipulates vanilla XML documents, but semantic knowledge can be embedded in specialised classes. Steve will demonstrate three such usages: an XSL engine, UI configuration, and rendering a database schema in XML via JDBC. The basis for expandability is to 'register' information about specific XML element types:


Steve will demonstrate these ideas using his XML Testbed application, which implements them all and is also a basic XML authoring environment. Steve hopes to demonstrate nearly-WYSIWYG XML editing driven by XSL style rules - if it's working in time.

About the Presenter

Steve Withall has been developing commercial software for eighteen years, the last eight designing large-scale object-oriented systems. He currently works for Access Systems in Sydney, a company formed to develop Interactive Television applications. For this, he and his colleagues developed a language for describing ITV user interfaces: PNML - Pretentiously Named Markup Language. (Why couldn't XML have been around then?!) While the company has moved on from ITV, PNML is still used for various purposes. Steve comes to XML from a very different direction than the SGML gurus!

Responsible for, among other things, extracting documentation from thirty unruly software engineers, Steve has an active interest in automatically generating system documentation where possible, and is using XML and XSL to develop solutions for this problem.

Note: The details of the Java 'XML Testbed' application used to demonstrate these ideas are now documented online, and the software is available from the W3C web server. Slides from the Montréal presentation are also available. - rcc, 980827

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/holman.htm]

XML Conformance

By Ken Holman

[This would be a brief report.]

At the first XML Developers' Day in 1997, OASIS (the Organization for the Advancement of Structured Information Standards) announced the early formation of a technical subcommittee to explore XML Conformance. Over the first year, this committee has explored the requirements for XML Conformance while the XML Community has finalized the standard and begun real-world implementations of the technology. This presentation briefly overviews the status of the work of the subcommittee, the approaches being considered for use in the committee results, and the needs for input from the XML Community that will help advance the effort.

Note: The presentation slides for "Report on XML Conformance" are available in HTML format. See the main database entry, XML Conformance.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/brian.htm]

Filtering XML Documents and Data Sets

Brian McFadden, Xtenit, Inc.

To meet the needs for several content management applications, we are developing a general filter that will use a simple yet powerful syntax for selecting and filtering XML documents and data sets. This filter will be used in several applications for routing, categorizing , and retrieving XML documents and data sets. Characteristics and advantages of the syntax used are:

The core process for the filter supports distributed sets of rules, and each rule can reference data from multiple documents and data sets, (for example document selection rules could reference both profile and content).

Examples of applications include:

Our presentation will discuss our approach, summarize the syntax used, and give specific examples of applications with XML documents and DTD's.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/papresco.htm]

Python: the 100% Buzzword Compliant XML Processing Language

By Paul Prescod (ISOGEN International Corporation)

Python is a simple, powerful programming language. It is designed to solve many of the same problems addressed by Perl (text processing), TCL (embedding), Visual Basic (user interfaces and prototyping) and to a lesser extent, Java (distributed, portable applications). Instead of being yet another over-specialized "scripting" language, Python shares its best features with many great languages and integrates them in a predictable way. With Smalltalk and Scheme it shares flexibility and simplicity, with the Algol family, a familiar infix syntax, with the Simula family, object oriented programming features and with Perl, an open development model, powerful text processing features and a versatile set of standard libraries (including XML processing tools).

These features make it perfect for processing XML and SGML documents efficiently and conveniently. The Python XML Special Interest Group has been charged with the task of making libraries and documentation for processing XML and SGML documents, W3C DOM objects, ISO Groves and SAX data streams.

Python code can run in a highly portable, Python-optimized bytecode interpreter, or in any Java virtual machine. When run in the Java environment, Python code can be distributed across the network in JVM classfiles. This code can use any Java classes and libraries (including SAX parsers and the AWT). Thus, Python can be used either instead of, or in addition to Java, especially where a project requires faster coding or more flexibility than Java provides.

In short, Python is an easy to learn, scriptable, portable, distributed, multithreaded, web-aware, embeddable object oriented language for everything from rapid prototyping to large system development. Thanks to the efforts of the XML SIG, it is also shaping up to be a very robust platform for XML processing. This talk will describe the products and plans of the SIG.

The presentation slides are available online.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/tbray2.htm]

Reifying the DPH

    Tim Bray

Meeting the needs of the symbolic DPH (Desperate Perl Hacker) has always been one of the key design goals of the XML project. Fortunately, the perl community has decided to meet us half-way. This short presentation describes the work accomplished to date on giving perl the ability to process XML, which has involved wiring in the expat XML processor.

The work has progressed far enough to allow the construction of a variety of different experimental interfaces to XML documents for perl programmers. Several such APIs are now available. I will describe how one goes about constructing such APIs, and will demonstrate the use of one aimed directly at the DPH.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/rbrown.htm]

InDelv XML/XSL editor and Java class library

Rob Brown
InDelv, Inc.

First public presentation of a wysiwyg XML editor which accurately renders XML using XSL style sheets. This software was developed by rewriting a commercial text class library from scratch, specifically for Java and the new XML family of standards. It creates documents which can be displayed or printed internally, exported as XML / XSL for use in other tools, or converted to HTML for viewing by traditional web browsers.

XSL is used as the internal rendering model with DSSSL based flow objects and format characteristics. Support for the DSSSL formatting model roughly corresponds to the DSSSL Online proposal of August 96. XSL will be supported to the greatest extent possible relative to the XSL Working Draft due in July 98 (hopefully including element reordering, literal text and named styles).

The document model implements DOM (Core) Level 1 and parsing is handled by any SAX compliant XML parser. The linking and text selection model is based on XLL. Key design goals include fast on-screen rendering, accurate printing and flexible application setup. XML is used to specify menu definitions, key maps, view and window layout, event hooks, nls string translation and user preferences. The intent is that 'XML applications' can be created and deployed by non-programmers and so far the results have been promising.

The version being presented is a 'Technology Introduction' and is intended for use by experienced programmers and visionary XML hackers. Some capabilities will be limited. In particular, it will have minimal support for DTD's and traditional SGML authoring features. The editor can enforce hierarchical integrity and infer types for new elements, however much of the work planned in this area will wait for DOM DTD support to stabilize and a validating SAX to emerge.

A retail product based on this class library is targeted to ship in late August (Java and Smalltalk) on a fully supported basis. It would be useful for developers who want to begin working visually with XML now and yet are willing to wait for additional features. More details will be made available at the session.

Note: InDelv has now annnounced its plans to offer a new commercial XML/XSL editor in mid-September. It is to support the new XSL working draft released by W3C on August 18, 1998. [announcement, local archive copy] -rcc 980826

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/tbray.htm]

Construction of the Annotated XML Specificiation

Tim Bray

The idea of the annotated XML specification is simple; a collection of relatively small pieces of commentary attached directly to the electronic version. Since there are some parts of the XML spec that clearly cause people trouble, it is important that the annotations be very highly localized.

The decision to use XLink and XPointer was easy, and the result was gratifying, but the hurdles along the way were of considerable technical interest. The included:

  1. Implementation of partial XLink and XPointer processors.
  2. Design of a language to contain the annotations and all the XLink and XPointer apparatus.
  3. Bridging the gap between the XML form of the spec and annotations, and the XML-oblivious browsers of the world.

This presentation will introduce each of these technical hurdles, describe the chosen solutions, and offer a hindsight-based opinion as to what the correct solutions might be.

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/peterm-r.htm]

The Virtual HyperGlossary - adding semantics and ontology to XML

Peter Murray-Rust and Lesley West

VHG Consulting, Ltd

XML allows authors to create their own markup (e.g. <DOMAIN>), but no direct handle for answering 'what does this mean?'. One of the most powerful (but very cost-effective) ways of adding meaning is by linking to terminological resources such as glossaries or dictionaries. Although there are a large number of HTML-based glossaries (often of very high quality) on the WWW there is no consistent syntax. It is almost impossible to search for terms in a robust and meaningful manner. For example the semantics of brackets in "Domain (DNS)" are different from the semantics in "eXtensible Markup Language (XML)". The first is a qualifier, perhaps distingusing the term from "Domain (protein)", while the second is an acronym.

We have developed a simple but scalable DTD for terminology based on ISO 12620 (Data Categories for Terminology). This DTD uses a deliberately small subset of about 12 categories (e.g. <term>, <acronym>, <synonym>, <abbreviation>, <definition>). Others can be added through an attribute-based syntax. Hyperglossary is used in a wide sense to include any semantic resource composed of standardised subcomponents such as data sheets or catalogues. Thus a molecular hyperglossary could include chemical structures, measured properties and commercial availability.

Because XML is tree-based it supports hierarchical collections (thesauri, catalogs, etc.) in a natural and powerful manner and we have found that most of our current examples fall into it. For non-hierarchical relationships (<see>, <seeAlso>, multiple broaderTerms, etc.) the VHG uses the full power of XLink to add additional structure. Thus terms can be grouped in different classifications by using xml:link="extended" with locator references to the linked terms. Equivalences (e.g. in multilingual glossaries) can be defined through an external link database. This allows different language curators to develop their glossaries in parallel and link the terms through XML ID's.

Curators are a key aspect of VHGs and we expect that many VHGs will be XLinked to 'neighbouring glossaries' especially where the curators know each other. This avoids the pitfall of a 'grand universal classification' and allows readers to explore multiple interpretations of the same term. Learned societies and other authoritative providers of public information can benefit by making their current terminologies (often paper-based) available. We shall show an example from a collaborating International Union and we are also partnering with providers of commercial semantic resources.

For organisations developing 'knowledge capture' strategies, terminology is an essential component. By encouraging distributed hyperglossaries on an Intranet an organisation can empower invidividual units to capture and manage their terminology without excessive central overheads.

The VHG is applicable to any domain, but has specific support for technical subjects. We have encoded scientific units (SI and non-SI) into VHG format and this means that unit conversions (currently very problematic) can become automatic.

The VHG DTD is completely implemented in JUMBO-VHG (JUMBO is a freeware system based on SwingSet) and demonstrations of many applications will be given. These will include component-based creation and editing of glossaries. We shall also show Virtual HyperMarkup which is the detection of terms in XML-based documents and their linking to appropriate glossaries. This enhances the semantic value of the document and should also lead to normalisation of information if glossaries are widely available, e.g. through cascading glossary servers.


The terms in REC-xml-19980210.xml have been abstracted and transformed to validate against the VHG DTD. They are displayed in JUMBO-VHG with the terms in a 2-level tree (left) and a specific term (dt-fatal) shown right. The style is one of 7 builtin JUMBO styles.


Full information about the VHG including references can be found at the VHG Home Page

(a) Also at Virtual School of Molecular Sciences, University of Nottingham, UK

(b) VHG is being registered as a trademark by VHG Consulting, Ltd.

Note: See the main database entry, "Virtual Hyperglossary (VHG)."

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/fensterm.htm]

Using XML in Knowledge Management

Kurt D. Fenstermacher

Intelligent Information Laboratory
University of Chicago Dept. of Computer Science

We are building a system (called SingleSource) for information capture and access within a strategic consulting firm. Within the firm, consultants working with clients request information on topics ranging from: "What's the GDP per capita of India?" to "What factors will impact the demand for petroleum products over the next decade?" While researching these questions, information professionals need to search and collate results from many sources, both online and offline. Our prototype provides a front-end for researchers within the organization to search multiple online sources, view clustered search results and finally produce a finished document summarizing the requested information.

Smart information retrieval

The SingleSource environment will aid researchers in finding information, while simultaneously storing information about their search strategies. As the system "learns" search strategies for kinds of search queries, it will use that information to improve later retrievals. For example, if one researcher (who specializes in the automotive industry) frequently uses only a handful of sources to answer questions, the system will store an association between automotive questions and those few (but highly relevant sources). When a less experienced researcher has a question about the automotive industry, SingleSource will focus the queries on the best automotive sources, and recommend the automotive specialist as a contact.

XML in SingleSource

The prototype system depends on XML (or XML-based technologies) in several ways (each description is followed by a note regarding its likely stage of completion by conference time):

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/kimber.htm]

Eliot Kimber Presents: Grove-based XLink Implementations

Eliot Kimber (Isogen) will give a demonstration of PHyLIS, Personal HyTime Link Information System, an attempt to implement the HyTime standard using componentized software techniques (ActiveX). PHyLIS uses a literal grove-based approach and demonstrates the ability to apply XLink, SGML architecture (AFDR), and HyTime processing to XML documents in a completely standards-based environment. PHyLIS is designed to be an open integration platform that is infinitely extensible. See www.phylis.com for details, including source code.

Eliot will also demonstrate an implementation of an XLink processor developed by Masatomo Goto of Fujitsu Laboratories. This processor uses an implementation of the XLink property set based on the HyTime property set. Supported features include:

Fujitsu Laboratories plans to integrate this XLink processor with its "HyBrick" browser later this year. For further information on "HyBrick", see http://collie.fujitsu.com/HyBrick.

Note: Presentation slides for "Grove-based XLink Implementations" ['Xlink and Groves'] are available online. See also the main section for XLL (XLink, XPointer).

[GCA Website URL: http://www.gca.org/conf/meta98/xmldev98/megginson.htm]

XAF: Using Architectural Forms with XML

David Megginson, Megginson Technologies Ltd.

Architectural Forms are an International Standard (ISO/IEC 10744:1997, clause A.3) for applying multiple inheritance to XML and SGML documents.

Megginson Technologies has recently released the first version of XAF, a general-purpose Architectural Forms processor for XML using the widely-supported SAX (Simple API for XML) interface. XAF is available free of charge at the following location:


This presentation begins with a brief overview of Architectural Forms, then compares Architectural Forms with XML Namespaces to show how the two specifications can work together.

The second part of the presentation introduces the XAF software itself and examines the design decisions and compromises that were necessary to implement Architectural Forms using XML and SAX.

Note: David Megginson's presentation slides are available online in HTML and PDF format. For related information, see the main section: Architectural Forms and SGML/XML Architectures.