The D1 event database contains the data, e.g. photon events, needed by beginning stages of any scientific analysis. Access by all scientific analysis clients will be via the layer known as the U1 data extractor. U1 verifies that queries are valid, then sends them to the the D1 tool, the internal entity which has direct access to the data. U1 receives the data from the D1 tool, then (may? or always?) reformat it into FITS files before returning it, along with status information, to the client.
What about something about adding or replacing data? Should there be an overview paragraph about that?
Must support read, write, modify and monitor functions. Perhaps also delete.
Only program access is promised though, depending on choice of implementation, interactive access may be available as well.
Probably just read functions of various sorts, both of bulk data and metadata. Need to support several selection criteria (cuts).
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