Positional parameters and question mark notation

Hi,

Is there any way to make PostgreSQL support the question mark (?)
notation instead of the dollar sign ($1, $2...) for prepared statements?
Most databases use the question mark notation and we have a set of
simple queries that are supposed to be portable across different
database systems. So far we use PostgreSQL via ODBC, but now we want to
switch to a native libpq implementation.

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with best regards,

Andreas Lubensky