Not all formats developed by the PSI have been successful and widely used. The mzData format released in 2005 was deprecated in 2008 with the release of mzML, which incorporated all of mzData's functionality. The sepML and gelML formats were well designed and still potentially usable, but there was no interest in the community to encode the many details of gel-based workflows and for other separations used in proteomics experiments and have been deprecated due to little interest. Should interest revive in capturing such data, they remain good foundational work. The TraML format for encoding SRM transition lists and DDA inclusion lists was used by a few software packages after its release, but the extreme popularity in the SRM field of the Skyline software, which used its own .sky format and never supported TraML, rapidly led to the TraML format becoming largely unused. mzQuantML was developed as an XML-based format to capture a detailed output of proteomics quantitative workflows. However, its adoption was limited due to a preference from most software developers to export quantitative output data in flat text files. When mzTab was released later, there was the hope that this simpler tab-delimited format could become popular to represent the final results coming from quantitative experiments. As mentioned above, although mzTab has been implemented, it has been mainly used for capturing identification results only so far. Very regrettably, the field has been unable to agree so far on a format for capturing quantitative information. This situation really hinders further progress and the reuse and integration of proteomics data.