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a set of key/value pairs

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Does anyone have a specific example of how to:
    1) create a variable that is a set or array of key value pairs?
2) how to populate each element of the array (each element being a key / value pair) 3) how to iterate through the list or array retrieving each key/value pair?

Please do not point me to this doc:
    http://developer.postgresql.org/pgdocs/postgres/hstore.html

What I am looking for is an example as listed in 1..3 above, and that is not provided in the doc.

Regards,


J.V.

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