KnowledgeBase

A knowledge-base is a combination of ontologies and their instance data. The triples that make up a knowledge-base can be spread over several named graphs.

NamedGraph

A named graph is a collection of triples in the Triple store. A named graph is an entity that is subject to access control.

GraphMetaData

Data that describes meta-information about a named graph. This is typically the creation date, the state of the data within the graph, authorization information, etc..

Ontology

An ontology is a collection of classes and properties that define the possible relations between instances of these classes as well as literal objects. Typical examples of ontologies are FOAF, VCARD or SIOC.

Data Set / Instances / Resources

Tag

Index term assigned to a piece of information.

Tagging

The process of assigning tags to a piece of information or a document, personally by the item's creator or viewer or semi-automatically via natural-language-processing tools.

Taxonomy

A Taxonomy is a controlled vocabulary which has a strictly hierarchical structure. Each instance in a taxonomy is in one or more parent-child relationships to other instances. A taxonomy is described using an ontology which defines hierarchies. A typical example would be SKOS.

Thesaurus

Network of controlled vocabularies containing synonyms and sometimes antonyms.

Vocabulary

Dictionary containing unambiguous, non-redundant terms and their definitions. The terms in a vocabulary are described using an ontology.

ControlledVocabulary

A Vocabulary which is subject to an editorial process or even fixed one.