Each resulting point inherits all attributes from its source feature.
Additionally all point features receive the attributes _feature_number and _vertex_number which, in combination, are unique for every source feature and, respectively, its parts.
The _part_number indicates whether the resulting point was derived from a donut polygon or an aggregate. If a donut or an aggregate was the origin, the _part_number is 0 for the first part and 1 or greater for all other parts. The _part_number is 0 in case of simple features.
Note: If you don't need to know the part numbers, you can also use the Chopper transformer which comes with FME. Setting Maximum Vertices to 1 in the Chopper exposes feature vertices.
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