No subject

authority (SA) and the event identifier (EID).  I've not see any
instance identifiers in the data.  As for how they are mapped, from
what I can tell, they are just unique ids created by the SA.  Since
each channel has it's own SA, there is no correlation of encoding
schema.  Thankfully, four channels share the same SA (tvnz.co.nz,
1,2,6, and 7).  So as long as the same show stays on the same SA, you
shouldn't get duplicates.  However, if the same show appeared on a
different SA, it would be issued another EID by that SA.  And they are
completely different in their conventions too.

Mythtv also has duplicate checking on title/description, but I'm
unaware how well that works without other metadata present.  I've
written more code last night that I hope to finish today.  It adds
dd_progid for the series/show ID and a master file for series
containing categories metadata.

sV