NDF_XDEL( INDF, XNAME, STATUS )
-- Delete a specified NDF extension
NDF_XGT0x( INDF, XNAME, CMPT, VALUE, STATUS )
-- Read a scalar value from a component within a named NDF extension
NDF_XIARY( INDF, XNAME, CMPT, MODE, IARY, STATUS )
-- Obtain access to an array stored in an NDF extension
NDF_XLOC( INDF, XNAME, MODE, LOC, STATUS )
-- Obtain access to a named NDF extension via an HDS
locator
NDF_XNAME( INDF, N, XNAME, STATUS )
-- Obtain the name of the N'th extension in an NDF
NDF_XNEW( INDF, XNAME, TYPE, NDIM, DIM, LOC, STATUS )
-- Create a new extension in an NDF
NDF_XNUMB( INDF, NEXTN, STATUS )
-- Determine the number of extensions in an NDF
NDF_XPT0x( VALUE, INDF, XNAME, CMPT, STATUS )
-- Write a scalar value to a component within a named NDF extension
NDF_XSTAT( INDF, XNAME, THERE, STATUS )
-- Determine if a named NDF extension exists