AttributeKeeper

From Fmepedia

AttributeKeeper is a Workbench Transformer.

Removes all attributes from the feature, except those chosen in the list.

This can be useful when features have large numbers of unnecessary attributes. You can clean up the features so that they only have the attributes you want to work with.

In case the number of attributes you want to keep is greater than the number of attributes you want to remove, try the AttributeRemover.