In plpgsql, if you write

OPEN var BLAH

you can an error message like this:

ERROR:  syntax error ...
DETAIL:  Expected "FOR", to open a reference cursor.

But what is a "reference cursor"?  Isn't this rather saying "... to open a 
cursor, a reference to which will be stored in your variable"?  Anyone got a 
better idea for a wording?

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