id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
573	psMetadata needs PS_DATA_UNKNOWN	Paul Price	robert.desonia@…	"The Metadata must be able to handle other types than those in psLib (so long as
they have been allocated with psAlloc), e.g., so that the modules can use the
psMetadata with its own types.  For this, we use PS_DATA_UNKNOWN (i.e., unknown
by  psLib), but the psMetadata doesn't recognise PS_DATA_UNKNOWN.

Need to add on line 281 of psMetadata.c:
case PS_DATA_UNKNOWN:                 ///< Unknown type"	defect	closed	high		types	0.8.0	normal	fixed