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Identification result issued from a search engine, such as Mascot® server and validated by user are represented by Identification. These identification could have been done on 1 peak list or on a merged peak list. In the first case, a unique Run is associated to the identification to represent the spectrometer acquisition. In the latter case, where a merged peak list have been submitted to the search engine, there will be few Runs associated to the identification, one for each original peak list. In all case, a Sample can be associated to the Run. In some rare case, when run represents acquisition control, there will be no sample linked to the run.