The Dutch ColoRectal Audit - Radiotherapy is the national clinical quality of care registry for radiotherapy treatment of colorectal carcinoma. The registry contains information about target areas, dose volumes histograms and organs at risk and is used by a growing number of Radiotherapy centres to store information for quality indicators, benchmarking and scientific research. This standard defines the metadata required to insure availability, versioning and interoperability of the DCRA-R data.