VertexMappingParameterType = getResourceOrNull(graph, URIs.VertexMappingParameterType);
VertexScalePropertyParameterType = getResourceOrNull(graph, URIs.VertexScalePropertyParameterType);
VertexSizeStyle = getResourceOrNull(graph, URIs.VertexSizeStyle);
VertexMappingParameterType = getResourceOrNull(graph, URIs.VertexMappingParameterType);
VertexScalePropertyParameterType = getResourceOrNull(graph, URIs.VertexScalePropertyParameterType);
VertexSizeStyle = getResourceOrNull(graph, URIs.VertexSizeStyle);