This document has the following parts:

• Part I provides conceptual and usage information about RDF Semantic Graph.

• Reference and Supplementary Information provides reference information about RDF Semantic Graph subprograms; it also provides supplementary information in appendixes and a glossary.

Part I contains the following chapters:

• RDF Knowledge Graph Overview
  Oracle Spatial and Graph support for semantic technologies consists mainly of Resource Description Framework (RDF) and a subset of the Web Ontology Language (OWL). These capabilities are referred to as the RDF Knowledge Graph feature of Oracle Spatial and Graph.
• OWL Concepts
  You should understand key concepts related to the support for a subset of the Web Ontology Language (OWL).
• Simple Knowledge Organization System (SKOS) Support
  You can perform inferencing based on a core subset of the Simple Knowledge Organization System (SKOS) data model, which is especially useful for representing thesauri, classification schemes, taxonomies, and other types of controlled vocabulary.
• Semantic Indexing for Documents
  Information extractors locate and extract meaningful information from unstructured documents. The ability to search for documents based on this extracted information is a significant improvement over the keyword-based searches supported by the full-text search engines.
• Fine-Grained Access Control for RDF Data
  The default control of access to the Oracle Database semantic data store is at the model level: the owner of a model can grant select, delete, and insert privileges on the model to other users by granting appropriate privileges on the view named RDFM_<model_name>. However, for applications with stringent security requirements, you can enforce a fine-grained access control mechanism by using the Oracle Label Security option of Oracle Database.
• RDF Semantic Graph Support for Apache Jena
  RDF Semantic Graph support for Apache Jena (also referred to here as support for Apache Jena) provides a Java-based interface to Oracle Spatial and Graph RDF Semantic Graph by implementing the well-known Jena Graph, Model, and DatasetGraph APIs.
• User-Defined Inferencing and Querying
  RDF Semantic Graph extension architectures enable the addition of user-defined capabilities.
• RDF Views: Relational Data as RDF
  You can create and use RDF views over relational data in Oracle Spatial and Graph RDF Semantic Graph.
• RDF Integration with Property Graph Data Stored in Oracle Database
  The property graph data model is supported in Oracle Spatial and Graph. Oracle Spatial and Graph provides built-in support for RDF views of property graph data stored in Oracle Database.