Management of External Data (SQL/MED) in core?

Hi all,

It's probably me not understanding what is being claimed, but on
http://www.postgresql.org/docs/8.4/static/features.html it says
PostgreSQL core covers ISO/IEC 9075-9 Management of External Data
(SQL/MED).  I'm aware the actual SQL/MED functionality isn't
implemented yet.  Is this purely to do with the provision of foreign
data wrappers, creating servers etc?

Thom