# SAREF4GRID ontology and semantics


## Introduction and overview


The present document is a technical specification of SAREF4GRID, an extension of SAREF for the Smart Grid domain. This extension has been created by investigating resources from potential stakeholders of the ontology, such as standardization initiatives, associations, and existing ontologies and standards, as reported in ETSI TR 103 904 [i.1]. In addition, the use cases defined in ETSI TR 103 904 [i.1] were also considered, namely:

* **Use case 1**: Remote management of meters.
* **Use case 2**: Management of tertiary sensor devices.
* **Use case 3**: Management of OLTC transformers.
* **Use case 4**: Detection of meter connectivity.

SAREF4GRID is an OWL ontology that extends SAREF and reuses two other ontologies. SAREF4GRID includes 56 classes (41 defined in SAREF4GRID and 15 reused from the SAREF and oneM2M), 50 object properties (28 defined in SAREF4GRID and 22 reused SAREF from and oneM2M), 45 data type properties (43 defined in SAREF4GRID and 2 reused from SAREF and oneM2M), and 28 individuals.


SAREF4GRID focuses on extending SAREF in order to create a common core of general concepts for smart grid data oriented to the IoT field. The main idea is to identify the core components, as mentioned, that could be extended for particular smart grid subdomains, for example, for high voltage networks.


The prefixes and namespaces used in SAREF4GRID and in the present document are listed in Table 1.

{{table_1}}

