The SETI Net data base consists of the following objects.

1. Search - The collection of all Targets.  The complete Search is held in the database SETI.  There is one Search instance only.

2. Targets - The Search is made up of one or more Target instances.  Each is Target is a Star or other object from the list of objects available to SETI Net.  The Target is held constant through out the Search.  A single Target will start at the lowest of all Scan frequencies and end with the highest of all Scan frequencies (see the next figure). Scans may overlap in Start/End frequency.  When a Scan is added to a Target the  Lowest and Highest frequency of the Target is modified accordingly.

3. Scan - Each Target is made up of one or more Scans.  Each Scan contains a Start Frequency and an End Frequency and zero or one Hits. The frequency increases due to bin shift, frequency jumps or operator action. 

4. Hit - If a signal is detected during the processing of a Scan a Hit is created.  The recording system comes on and the JPG and WAV files are saved.  The operator manually ends the Scan and then sets the falsified flag on the Hit or leaves it as an open Hit. 

5. File - Each Hit generates one or more JPG files and one or more WAV files. The JPG is a visual image of the waterfall buffer used to extract signals.  The WAV file is the raw PCM data collected directly from the sound system. Each files also contains an SML instance.

6. SML - SETI Markup Language (SML) is defined here.  Each SML instance contains a complete description of the station configuration ( time, pointing angles, frequency and other engineering settings) when the file was created. .  Each SML instance is held in the files, JPG and WAV, that are generated during a Hit.