There have been several spectral library formats in wide use in the community for some time, including the NIST MSP format, the SpectraST 66,67 speclib format, several versions of the blib format, the hlf format, etc. While any one of these formats does a good job in encoding the spectra in the library, there is general agreement that none of the formats do a good job in encoding the metadata associated with the library in a consistent manner. An example is MSP, wherein nearly all metadata is recorded within the COMMENT field in a highly variable manner across software packages. Various producers and consumers of spectral libraries have come together to create a new standard called mzSpecLib (). It is quite similar to the MSP and speclib formats, with an emphasis on heavy use of CV terms and a standardized data model that can be encoded in several different serialization mechanisms, including an MSP-like text format, a JSON format, and potentially a more performant binary format based on HDF5 or SQLite. mzSpecLib is expected to enter the PSI DocProc in 2023.