XML/RDF Ontologies (OIL, DAML, RDQL, RQL, XRM)
�The Semantic Web is a web of data, in some ways like a global database.�
- Tim Berners-Lee

OIL
"The Ontology Inference Layer OIL is a proposal for a web-based representation and inference layer for ontologies, which combines the widely used modelling primitives from frame-based languages with the formal semantics and reasoning services provided by description logics. It is compatible with RDF Schema (RDFS), and includes a precise semantics for describing term meanings (and thus also for describing implied information)."

Diffuse.org: Metadata Interchange Standards
This section of the Open Information Interchange report provides information on standards that can be used for the recording of general-purpose data about data (metadata).
Harmony's ABC, Dublin Core, CC/PP, Directory Interchange Format, etc.

MIT AI Lab: The Haystack Project
The platform provides a common data repository, a unified data access abstraction, a data-oriented programming language, a software agent infrastructure, a data navigation framework, and a rich semantics-based user interface paradigm for visualizing semi-structured information. On this platform we are exploring a variety of research issues, including user interface personalization, computer-aided information corpus browsing, natural language-based search, automated information flow and collaboration, user-specified ontology management, freeform annotations, among others.

The ICS-FORTH RDFSuite: High-level Scalable Tools for the Semantic Web
  The Validating RDF Parser (VRP): The First RDF Parser supporting semantic validation of both resource descriptions and schemas
  The RDF Schema Specific DataBase (RSSDB): The First RDF Store using schema knowledge to automatically generate an Object-Relational (SQL3) representation of RDF metadata and load resource descriptions.
  The RDF Query Language (RQL): The First Declarative Language for uniformly querying RDF schemas and resource descriptions.
  References
  As described by Hector Ceballos:
  "This suite includes RDF storage in a PostgreSQL DB, and a query language (RQL) that access the stored ontologies. By now, it just let you use RDF, not DAML+OIL. The suite includes tools for storing the RDF file, including classes, properties and instances."

PARKA-DB: Back-End Technology for High Performance Knowledge Representation Systems
"In this paper we discuss a system which uses an ontology to provide access to, and loading from, a medical database system. The �pure� ontological information is used to define which individuals in the database are of interest for further analysis. The system then loads the information about these individuals into a �hybrid� ontology, one which ties the specific instances to the more general ontology. To support the large ontologies needed in this application (and a number of others), we use Parka-DB*, a scalable ontology management system that uses relational database techniques to provide many desirable operational features."

KAON - The Karlsruhe Ontology and Semantic Web Tool Suite
"KAON is an open-source ontology management infrastructure targeted for business applications. It includes a comprehensive tool suite allowing easy ontology creation and management, as well as building ontology-based applications. An important focus of KAON is on integrating traditional technologies for ontology management and application with those used in business applications, such as relational databases."

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