I think there is a difference:
0 confidence = I have checked this information and I do not have any faith that it is true.
Unknown = There is no information to say if this is true or not true. We have no way to infer anything at present.
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Reliability of Source
A - Completely reliable
B - Usually reliable
C - Fairly reliable
D - Not usually reliable
E - Unreliable
F - Reliability cannot be judged
Accuracy of data (Credibility)
1 - Confirmed by other sources
2 - Probably True
3 - Possibly True
4 - Doubtful
5 - Improbable
6 - Truth cannot be judged
Maybe that makes sense more so than Confidence?
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I also believe that we need to keep each relationship as a single direction relationship, to enable someone to discern a 'hierarchy' from the relationships they receive, rather than just a 'group' (as highlighted by others on the thread). If we combine all the relationships into a pool, we lose the ability of separating those relationships back out. I would like to keep the Source_ID and Target_ID separation.
- ID [1] [Required]: The ID of the relationship
- Version [1] [Required]: The version of the relationship; a simple number to be used with the ID for version control (instead of timestamp)
- Type [1] [Required]: The “type” of relationship being expressed. (Not sure of how this works yet)
- Description [0..N] [Optional]: Words about the relationship.
- Source_ID [1] [Required] : The ID of one or more source entities in the relationship as a URI (not QName)
- Target_ID [1..N] [Required]: The ID of one or more targets in the relationship as a URI (not QName)
- Start_Time [0..1] [Required]: A timestamp in UTC stating when the relationship between the objects started, or the text 'unknown'.
- End_Time [0..1] [Required]: A timestamp in UTC stating when the relationship between the objects ended, or the text 'ongoing', or the text 'unknown'.
- Confidence [1] [Required]: A measure of confidence in the relationship. (or should we look at Reliability/Credibility as discussed above?)
- Timestamp [0..1] [Required]: A timestamp in UTC stating when the relationship object was created.