Op 11-04-12 23:12, Ian Walls schreef:

> I'd say just stop counting at 99999, and let the export scripts provide
> the recalculation, truncation or warning.  Since we don't include items
> internally in our MARC except for indexing, we shouldn't run into this
> situation very often now.

This would be OK for a single record. My concern is if we ever end up
with a block of USMARC records glommed together, could we separate them
out without a correct length header? Is there an "end of record" flag?