Summary of Message Tokens Used

The following table summarises all the message tokens used by the NDF library in format conversion commands, etc:

Token	Value
dir	Directory in which the foreign file resides
name	Foreign file name (without directory or extension)
type	Foreign file extension (with leading `.')
vers	Foreign file version number (blank if not supported)
fxs	Foreign extension specifier (see § )
fxscl	Clean version of fxs (all non-alphanumeric characters replaced by underscores)
fmt	Foreign format name (upper case)
ndf	Full name of the native NDF format copy of the dataset
xtn	Name of the NDF extension (upper case)

Each environment variable which is used to control access to foreign format data, and which permits substitution of the above message tokens, is of the form:

NDF_$<$CTX$>$_...

where $<$CTX$>$ is the name of a ``context'' within which message token substitution takes place. The following table shows which tokens are defined for use within each context:

		Token
		dir	name	type	vers	fxs	fxscl	fmt	ndf	xtn
	FROM	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\times$
	TO	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\times$
	DEL	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\times$	$\times$
Context	KEEP	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\times$	$\times$
	TEMP	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\times$	$\times$
	IMP	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$
	EXP	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$	$\surd$