There are several transformers that produce fixed attributes (NeighborFinder, TopologyBuilder, SpatialRelator, etc). When using them in a custom transformer I have no idea if I am overwriting any previously existing attributes and would like the option to specify a prefix for these attributes. Our local rule of thumb is all interim attributes in a custom transformer start with _!, and that pattern is never used outside of custom transformers. So for the NeighborFinder, with a prefix of _! would produce _!_distance, _!_angle etc.
Archived
Option to prefix autogenerated attributes
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