Copyright © 2015 Open Geospatial Consortium.
25 would benefit the Web 2.0 community at large by removing the barriers of
interoperability between various social media and social network services.
10.3 Portrayal Ontologies
Portrayal Ontologies specify a conceptual model for portrayal data, in particular symbols and portrayal rules. Portrayal rules associate features with symbols for the portrayal of
the features on maps and other display media. These ontologies include classes, attributes and associations that provide a common conceptual framework that specifies the structure
of and interrelationships between features, portrayal rules and symbols. It separates the content of the data from the portrayal of that data to allow the data to be portrayed in a
manner independent of the dataset. The graphic description is intended to be format independent but convertible to any target formats SVG, KML. The ontologies are
derived from concepts found in existing portrayal specifications ISO 19117, OGC Symbology Encoding and Styled Layer Descriptor Profile of WMS.
To favor reusability, the Portrayal ontologies are decomposed into four micro-theories see Figure 6:
Style ontology: defines the concept of Style and portrayal rules. Symbol ontology: defines the concept of SymbolSet and Symbol and structural
definition of Symbol components.
Graphic Ontology: defines graphic elements including graphic objects and
attributes.
Portrayal Catalog Ontology: Defines the concept of Portrayal Catalog
Figure 6 Portrayal Microtheories
More information about the portrayal ontologies can be found in the Symbology Mediation ER OGC 15-058
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10.4 SPARQL Extensions Ontology
The SPARQL Extensions ontology defines concepts that allow the definition of custom functions and mapping using SPARQL standards. This ontology provides the core
building blocks for defining semantic mediation mappings but it has also other applications such as defining constraints on classes, annotating classes with inference
rules, defining templates for pre-canned queries. More information about the ontology can be found in the OGC Symbology Mediation Engineering Report OGC 15-058
10.5 Semantic Mediation Ontology
