public void setExportTagged(Set<String> exportByTags) {
            this.exportTagged = exportByTags;
        }
You can <em>export</em> trait definitions by applying specific tags
to the trait definition and adding the list of export tags as an
argument to the transformer.

@param exportByTags Tags that cause trait definitions to be
                    exported.
smithy-build/src/main/java/software/amazon/smithy/build/transforms/RemoveTraitDefinitions.java