Vicmap Topographic Themes - Features of Interest (FOI) Index Extent Polygon

VTT_FOI_INDEX_EXTENT is part of the Vicmap Topographic Themes (VTT) prooduct. This dataset is a superset of FOI_INDEX_EXTENT and includes the current and retired states of each feature instance. It supports feature versioning (RETIRE_DATE_UFI) and enables feature edit chaining (UFI_OLD).Part of the VTT Features of Interest datasetPolygon extent of ALL features of interest records within Victoria. It holds ALL features ONCE regardless of whether they were derived from a point, line or polygon feature.VTT_FOI_INDEX_EXTENT 属于维多利亚州地形主题数据集（Vicmap Topographic Themes, VTT）的组成部分。该数据集是FOI_INDEX_EXTENT的超集，涵盖各要素实例的当前状态与已退役状态。它支持要素版本控制（RETIRE_DATE_UFI），并可实现要素编辑链式关联（UFI_OLD）。本数据集隶属于VTT兴趣要素（Features of Interest, FOI）数据集，包含维多利亚州境内所有兴趣要素记录的多边形范围；无论原始要素源自点、线还是多边形几何类型，所有要素均仅收录一次。