Yes NITRC XCEDE Schema David Keator The XML-Based Clinical Experiment Data Exchange Schema provides an extensive metadata hierarchy for describing and documenting research and clinical studies. XCEDE was originally designed in the context of neuroimaging studies and complements the BIRN-HID XCEDE Schema Domain Independent, CT, MR, PET/SPECT, EEG/MEG/ECoG http://www.nitrc.org/projects/qa_procedure/, http://www.xcede.org/XCEDE.html dbkeator@uci.edu