DCMTK

Currently, there is no dedicated class for the value representation "Unknown" (UN) but instead it is handled by DcmOtherByteOtherWord. Internally, the class DcmOtherByteOtherWord always checks for VR=OW (or internal type "lt") and treats all other VRs as "OB". It would be useful, and clearer from both user's and developer's perspective, to have a separate class for "UN", which would basically do the same as DcmOtherByteOtherWord for VR != OW.