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documentation/abstract.md

-The present document is a technical specification of SAREF4CITY, an extension of SAREF [[1]](#[1]) for the Smart Cities domain. This extension has been created by investigating resources from potential stakeholders of the ontology, such as standardization bodies (e.g. Open Geospatial Consortium), associations (e.g. Spanish Federation of Municipalities and Provinces), IoT platforms (e.g. FIWARE) and European projects and initiatives (e.g. ISA2 programme) as reported in ETSI TR 103 506 [[i.1]](#[i.1]). In addition, the use cases defined in [[i.1]](#[i.1]) were also taken into account, namely:
+The present document is a technical specification of SAREF4CITY, an extension of SAREF [[1]](#[1]) for the Smart Cities domain. 
+
+SAREF4CITY V2.1.1 is a major revision of SAREF4CITY, using updated reference ontology patterns specified in ETSI TS 103 548 [2] to solve the harmonization needs identified in ETSI TR 103 781 [i.2], with updated development framework and tools defined in ETSI TS 103 673 [3].
+
+This extension has been created by investigating resources from potential stakeholders of the ontology, such as standardization bodies (e.g. Open Geospatial Consortium), associations (e.g. Spanish Federation of Municipalities and Provinces), IoT platforms (e.g. FIWARE) and European projects and initiatives (e.g. ISA2 programme) as reported in ETSI TR 103 506 [[i.1]](#[i.1]). In addition, the use cases defined in [[i.1]](#[i.1]) were also taken into account, namely:
 
 - Use case 1: eHealth and Smart Parking.
 - Use case 2: Air Quality Monitoring and Mobility.
@@ -8,7 +12,10 @@ Taking into account ontologies, data models, standards and datasets provided by
 
 After the first complete implementation of the ontology, a second validation workshop, the "Towards interoperability and harmonization of Smart City models with SAREF4CITY" one, took place on the 22nd of November 2018 at the European Commission premises in Brussels. During the workshop the ontology was presented to a variety of stakeholders from industry to academia and public administration. Apart from observations and comments on the reuse and alignment with other ontologies, the discussion addressed more general questions like how to promote the adoption of SAREF or which is the technological and methodological support needed to create a SAREF ecosystem of collaborative ontologies.
 
-SAREF4CITY is an OWL-DL ontology that extends SAREF and reuses six other ontologies. SAREF4CITY includes 31 classes (13 defined in SAREF4CITY and 18 reused from the SAREF, time, geosp, geo, foaf, dcterms, org, cpsv, and time ontologies), 36 object properties (20 defined in SAREF4CITY and 16 reused from the SAREF, geosp, geo, and cpsv ontologies) and 7 data type properties (3 defined in SAREF4CITY and 4 reused from the SAREF ontology).
+The current version of the ontology, V2.1.1, represents the adaptation of the previous SAREF4CITY conceptualization according to the new SAREF core and the homogenization process across extensions.
+
+SAREF4CITY is an OWL-DL ontology that extends SAREF and reuses seven other ontologies. SAREF4CITY includes 124 classes (13 defined in SAREF4CITY and 111 reused from the SAREF, time, sf, geo, foaf, dc, org, cpsv, skos and time ontologies), 103 object properties (18 defined in SAREF4CITY and 85 reused from the SAREF, geo, skos and cpsv ontologies) and 13 data type properties (6 defined in SAREF4CITY and 4 reused from the SAREF ontology).
+
 
 SAREF4CITY focuses on extending SAREF in order to create a common core of general concepts for smart city data oriented to the IoT field. The main idea is to identify the core components, as mentioned, that could be extended for particular smart city subdomains, for example, for public transport.