Yes NITRC XCEDE Schema Syam Gadde XML-Based Clinical Experiment Data Exchange Schema (XCEDE)provides an extensive metadata hierarchy for describing and documenting research and clinical studies. XCEDE Schema CT, MR, PET/SPECT, Clinical Neuroinformatics http://www.nitrc.org/projects/xcede/, http://www.nitrc.org/projects/xcede/ syam.gadde@duke.edu