Artifactory Research Resources

Contents

• XML
• Metadata/Schema
• Ontology Editors/Creation Tools
• Programs
• Projects
• Miscellaneous
• Thanks

XML

• The base specifications are XML 1.0, W3C Recommendations Feb '98, and Namespaces, Jan '99.
• What is XML? by Norman Walsh, is a four-part intro (in HTML pages) that's very readable, has examples, hits most of the important points, and contains links into the official specification.

• XML: A Door to Automated Web Applications, by Rohit Khare (MCI Internet Architecture) and Adam Rifkin (California Institute of Technology), is a well-written, high-level, scholarly article that gives some historical background, some interesting uses of XML, and some salient differences between SGML, HTML, and XML. The link brings up an abstract; to download the full article, you need a login (free to IEEE members). Or send email to David to request a copy of the PDF version.

• The XML spec is nicely done to begin with, and The Annotated XML 1.0 Specification makes reading the spec even more palatable.
• The XML Revolution: Technologies for the future Web is a set of 130+ HTML "slides" intelligently covering a lot of the essential ideas.
• 20 questions on XML, by Trisha Gorman, answers some basic questions and some burning practical questions at a superficial level (such as, what do the Netscape and IE browsers do with XML?).

XML Collections

• The XML Home Page is maintained by The World Wide Web Consortium, the official source of XML and related standards.
  In addition, large, well-maintained bodies of material can also be found at http://www.xml.org and http://www.xml.com.
• The XML Cover Pages gives a great set of links to various introductory materials.
• WDVL's XML Resources Page gives an extensive set of links to many different XML resources, at all levels of expertise.

XML Groves

The "grove/property set" concept is the theoretical basis of the state of the art in information component addressing, formatting, and re-use. In the case of an XML or SGML document, the parser produces a "grove" as the result of the parsing process. The grove is a set of objects ("nodes") bearing certain relationships to one another, expressed as "property values".

• Groves, Grove Plans, and Property Sets in SGML/XML/DSSSL/HyTime
• Groves Explained

Metadata / Schema

• Dagstuhl Seminar: Semantics for the Web, organized by Dieter Fensel, Jim Hendler, Henry Liebermam, and Wolfgang Wahlster.
• W3C Metadata activity
• Metadata Architecture (Tim Berners-Lee)

SHOE (Simple HTML Ontology Extensions)

• The SHOE Home Page

RDF

• The RDF Model and Syntax Specification, together with The RDF Schema Specification, give the current official specs.
• An Idiot's Guide to the Resource Description Framework. Although I much prefer to think of myself as a "dummy", nevertheless I found this introductory material to be quite helpful (DLM).
• RDF and Metadata, by Tim Bray, gives the basic ideas of RDF, informally and superficially.
• RDF: The Resource Description Framework is a set of slides with some basic info and examples.

• Frequently asked questions
• RDF Made (Fairly) Easy
• RDF-DEV mailing list
• RDF at DSTC
• Introduction to RDF Metadata
• W3C Data Formats
• RDF Implementation in Java from IBM's Alphaworks

RDF Collections

• The RDF Home Page is maintained by the World Wide Web Consortium.
• Dave Beckett's RDF Resources is a large and high-quality set of links.

MCF

MCF was a predecessor to RDF, from Guha (who worked with Doug Lenat at CYC, then at Apple, then Netscape).

• Meta Content Framework Using XML (1997-06-06)
• An MCF Tutorial

WIDL

The Web Interface Definition Language is "... a meta-data syntax implemented in XML that defines Application Programming Interfaces (APIs) to web data and services", developed by webMethods for their automation technology.

• Description of WIDL

Topic Maps (XTM)

TopicMaps are likely to be an important contribution to the meta-space.  They are an existing standard based on SGML, now being ported to XML.  Jack Park (of VerticalNet) is working with the XML organizations to do this.  Topic Maps are also related to conceptual graphs (CG) and category theory (http://www.cs.toronto.edu/~sme/presentations/cat101.pdf)

• Presentations on Topic Maps

XMI

XML Metadata Interchange (XMI), a new OMG standard, unites the Extensible Markup Language (XML) with the OMG's Universal Markup Language (UML) and Meta Object Facility (MOF) so meta data can be described in UML, stored in MOF, and exchanged among tools and repositories via XML, according to OMG officials.   XMI can be used for representing processes.

• XML Metadata Interchange (XMI) Specification
• XMI Overview
• MOF Links

Java Metadata API Specification

• JSR-000040 Metadata API Specification

Ontology Editors/Creation Tools

There are a number of different ontology creation tools available, and links to some of these appear below. In addition, a paper that reviews six different ontological engineering tools, including Ontolingua, can be found at the site of WonderTools, a group in the Social Science Informatics department at the University of Amsterdam.

• GKB-Editor (Generic Knowledge Base Editor) SRI's own browser and editor for OKBC-compliant knowledge bases. The user should be familiar with KIF and frame languages.
• Protege Ontology Builder Another respected ontology editor, this time from Stanford's Medical Informatics Group. It has a nice graphical interface that makes it easier to use for non-professional knowledge engineers, although knowledge of frame languages is still helpful.
• OntoEdit is part of the OntoServer project. It's an editor for OIL (Ontology Interchange Language) and was created by the same group at the University of Karlsruhe.
• Ontolingua An ontology editor from Stanford's Knowledge Systems Laboratory, available for use through a Web interface. This seems to be one of the more well-known and widely-used editors. The user should be familiar with KIF and frame languages.
• Ontosaurus A Web-based browser and editor for LOOM knowledge bases, from ISI. Similar to Ontolingua.

• WebOnto
• WebKB-GE A tool to construct and manipulate the graphical form of Conceptual Graphs. . See also http://meganesia.int.gu.edu.au/~phmartin/WebKB/
• JOE (Java Ontology Editor) and related Ontology Editors from U of South Carolina
• ATT's CLASSIC System (commercial)
• Ontology Editor by Steffen Schulze-Kremer

Programs

• Control of Agent-Based Systems (CoABS)
• DARPA Agent Markup Language (DAML)
  • DARPA DAML page
  • DAML.org home page
• Taskable Agent Software Kit (TASK)

Projects

• SRI's DAML Project

Miscellaneous

• SemanticWeb.org A lot of information related to "a Web of meaning". News about semantic markup languages, projects, and tools, as well as extensive links.

Thanks

Artifactory Home Page

AI Center

Computer Science Lab

SRI International