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The data archives from space and ground-based telescopes present a vastopportunity for the astronomical community. We describe a classificationencoding system for stellar spectra designed for archival databases thatorganizes the spectral data by "spectral classes." These classes are encodedinto a digital format of the form TT.tt.LL.PPPP, where TT and tt refer tospectral type and subtype, LL to luminosity class, and PPPP to possiblespectral peculiarities. Archive centers may wish to utilize this system toquantify classes of formerly arbitrary spectral classification strings found inclassification catalogs corresponding to datasets of pointed spectroscopicobservations in their holdings. The encoding system will also allow users torequest archived data based on spectral class ranges, thereby streamlining anotherwise tedious data discovery process. Material in Appendix A is "normative"(part of the defined standard). Appendices B and C are "informative," meant toshow how one data provider (MAST) has opted to handle some practical details.

An Encoding System to Represent Stellar Spectral Classes in Archival Databases and Catalogs