About 25.000 observations will be stored in the ISO post mission archive. This archive will provide on-line access to the data, supporting documentation and software through a WWW interface. The basic interface will allow to select observations defined by standard criteria such as coordinates, source name, observing mode, exposure time, wavelength etc.
Users can also select data by engineering, trend and housekeeping parameters.
For flexibility, the ISO-PMA is required to allow a wider set of possible queries which also might include simple data processing on the server side. For example, users might want to select spectra of sources within a certain brightness level at a user-defined wavelength, or photometry in a certain color range. Operating system commands may be executed in TSQL, but it is not possible to use any local variables when executing the command. This system allow users to write their own functions and to execute a required set of TSQL-queries. UDF functions are implemented with a CGI interface to the PMA HTTP server.