ROWTYPE as parameter to function

I see that RECORD can't be used as a type of an argument in a function,
however, I see nothing that says tablename%ROWTYPE can't. Indeed from the
reason given for RECORD not being allowed I would have thought the %ROWTYPE
would have been.

May be I'm just being silly in what I'm trying to do. What I have is a view
called, say, myview which I am trying to trap inserts to so the real tables can
be written to. The view is the 'user interface' so to speak. So what I have is:

CREATE VIEW myview AS SELECT ...;

and what I'd like to do is:

CREATE FUNCTION myfunction (RECORD) RETURNS ... ;
CREATE RULE insert_myview AS ON INSERT TO myview DO INSTEAD
SELECT myfunction(NEW);

Obviously I can't use the RECORD type but when I create the function with:

CREATE FUNCTION myfunction (myview%ROWTYPE) RETURNS ... ;

the '%' gets reported in an error message.

I don't think triggers are the things to use, partly because I don't know
anything about these SPI functions available for accessing other tables within
them but also because I think the rule system is the correct route to trap such
things on a view. So, am I being sensible in trying this design? Am I doing
something that isn't permitted, like with the RECORD type, by trying to get an
entire row into a function in one variable?

--
Nigel J. Andrews
Director

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Logictree Systems Limited
Computer Consultants