Function ucdStatus( ucd )

Description:
Returns a token string giving the category of UCD compliance. UCD1+, UCD1 and SIAv1 ("VOX:")-style UCDs are recognised.

Possible return values are currently:

In the case of non-compliant values, more information can be found using the ucdMessage function.

Parameters:
ucd (String)
UCD string
Return Value (String):
"OK" for conformant UCD1+, otherwise some other value
Signature:
String ucdStatus(String)