"A new systems management technology known as SNOBASE (Semantic Network Ontology Base) or the Ontology Management System has been released by IBM alphaWorks. The Java-based application provides a "framework for loading ontologies from files and via the Internet and for locally creating, modifying, querying, and storing ontologies. It provides a mechanism for querying ontologies and an easy-to-use programming interface for interacting with vocabularies of standard ontology specification languages such as RDF, RDF Schema, DAML+OIL, and W3C OWL. Internally, the SNOBASE system uses an inference engine, an ontology persistent store, an ontology directory, and ontology source connectors. Applications can query against the created ontology models and the inference engine deduces the answers and returns results sets similar to JDBC (Java Data Base Connectivity) result sets."
""The Query Optimizer allows applications to query large knowledge bases, whose entire set cannot be loaded into the working memory, by querying the ontology source for appropriate pieces as they are needed. In addition, the task of the Query Optimizer is to not only optimize the retrieval of information from ontology sources, but also coordinate queries that span multiple sources. This component is still under construction, and will be added to future editions of IBM Ontology Management System..."
"The Ontology Source Connectors provide a mechanism for reading and writing ontology information to persistent storage. The simplest connector is the file connector that is used to persist ontologies to the local file system. In addition, there will be connectors for storing ontological information in remote servers. Also, the connectors are used to implement caching of remote information to improve performance and reliability...""
Their query language is based on DQL (DAML Query Language).
http://www.alphaworks.ibm.com/tech/snobase
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