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rendering operations on a specific feature are performed This allows symbol layer subclasses to know when a set of rendering operations all relate to a single feature, e.g. when a number of polygons are rendered which all belong to the same multi-polygon geometry attached to a single feature. Without these hooks, symbol layer subclasses have no stable method of knowing that these parts all relate to a single feature, or have no means of knowing when the final part of that feature has been rendered.