Whatever you do, downstream applications are probably just going to ignore that information anyway.  I've never bothered to look at the leader length when parsing MARC-XML, anyway.  

I would just make it zeros.

--Dave

-------------------------
David Walker
Interim Director, Systemwide Digital Library Services
California State University
562-355-4845


-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Sullivan, Mark V
Sent: Friday, June 29, 2012 6:52 AM
To: [log in to unmask]
Subject: [CODE4LIB] Leader in MarcXML Files ( Record Length )

All,



I received a question regarding a software library I have created and released as open source.  The record length in the leader ( positions 0-4 ) was not being calculated correctly when writing as MarcXML.  However, this raises a more philosophical and larger question.  What is the point of the first five digits of the leader, outside of a ISO2709 / MARC21 encoded record?   Should I calculate the record length AS IF it would be encoded in ISO2709? This would be computationally non-trivial and would likely double the time necessary for my software to write a MarcXML file. Should I just make the first five digits of the leader '00000', since it means nothing in the context of a MarcXML file?



Has anyone else pondered this question or have any input on how current systems work?



Keep in mind I could be writing a MarcXML record for a record created or modified in memory, so just using a pre-existing record length is not an option.



Many thanks for your consideration.


Mark V Sullivan
Digital Development and Web Coordinator
Technology and Support Services
University of Florida Libraries
352-273-2907 (office)
352-682-9692 (mobile)
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