Relationship module: how to prevent that redundant and/or duplicated relationships are added

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This issue is a summary of an email discussion about how to make sure that no 
redundant and/or duplicated relationships are added by users --- in 
Relationships module. 

1. Model: 
1.1 assign relationships a status, to have new relationships validated as any 
other piece of data
1.2 assign relationships metadata for creation (author, data) to be shown in a 
history tab for relationships (currently this tab does not exist).

2. User interaction: 
2.1 when adding a new relationship, it should be compulsory to provide a 
definition 
2.2 preferably, also some examples of instantiation of the relationship should 
be given

3. Functionalities available from GUI: 
3.1 for each relationship, show (sample) list of pairs instantiating it; 
3.2 include a quick search for relations with similar names. For example, this 
could prevent the creation of relationship "isRelatedConcept" when relation 
"Related" is already there. A similar issue was raised for the search module.

What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?

Please provide any additional information below.

Original issue reported on code.google.com by caterina...@gmail.com on 10 Feb 2011 at 12:58

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Original comment by gudrun.j...@fao.org on 7 Mar 2011 at 10:58

• Added labels: Milestone-2.1

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Original comment by yjaq...@gmail.com on 10 Mar 2011 at 11:47

• Added labels: Priority-Medium

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Original comment by yjaq...@gmail.com on 10 Mar 2011 at 11:51

• Added labels: Type-Improvement

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Original comment by yjaq...@gmail.com on 10 Mar 2011 at 11:55

• Added labels: AssignedTo-Prashanta, AssignedTo-Sachit