public void setExportTagged(Set<String> exportByTags) {
            this.exportTagged = exportByTags;
        }
You can <em>export</em> shapes that are not connected to any service
shape by applying specific tags to the shape and adding the list of
export tags as an argument to the transformer.

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