Does SQL/MED (ISO/IEC 9075-9) defines a writable foreign data wrapper interface I just can't find anything about it.

I don't have the paper or draft of the SQL:2011, and have almost only drafts from SQL:2008, 2006, 2003.

Does anyone know if "SQL/MED (ISO/IEC 9075-9)" defines a writable foreign data wrapper interface?
Yes, it does define a writable interface.