PLPGSQL function schema or table parameter

[Sidnei de Souza <sidnei@xxxxxxxxxxx>]

Is it possible to pass a table name and/or schema name to a plpgsql 
function?
How can I use them in the code? Which Types to use for each of the 
parameters?

E.g.

create or replace function MyTest (mySchema WhichType?, myTable 
WhichType?) returns integer as '

declare result integer;

Begin
     select id into result from mySchema.myTable where...
     return result;
End;
' language plpgsql;

Sorry if this issue has already been addressed before but I can't find 
any objective comments on this.
Thanks.
sidnei

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