SAVEPOINT setting:

I'm uncomfortable referring to the SQL standard for this question, because
I'm not completely sure that it is specified adequately/properly, but that
being said, the question is: What happens when Connection.setSavepoint("foo"); is invoked outside the bounds of atransaction?

For the simplest example,
    Connection conn = DriverManager.getConnection(...);
    conn.setAutoCommit(false); // required for Savepoint use.
    conn.setSavepoint("foo");

All documentation I've scanned both in JDBC and the SQL standard implies a transaction has already started (e.g., the SQL standard includes phrases like "within the current SQL-transaction", and the JDBC standard says "sets a savepoint within the current transaction." But, neither says what happens when there is no current transaction, and (per the SQL standard) the SAVEPOINT statement doesn't itself start a transaction, so I can't get around the problem that way....

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