An empty string is treated the same as stderr, and will result in logs being sent to standard error(which will be the Web server error log in most cases).
We don't convert value to number instantly after prompt, because after value=+value we would not be able to tell an empty string(stop sign) from the zero(valid number).
In the case of the typeschema, the empty string value has the special meaning that the type schema coincides with the namespace of the corresponding REF element.
This is either a space-separated list of names that begin the statement, or the empty string to define a new default statement(the default statement will replace the say statement).
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