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2.4.1.2 The "extension-region-end" Region has no 'areas' sub section. Suggest The extension-region-end specifies a viewport/reference pair that is located on the "end" side of the region-body, meaning that the before edge of the extension-region is aligned with the before-edge of the region-body and the end-edge of this region is parallel to the start-edge of the region-body, at a distance specified by the "distance"attribute.