Bibs transformation task should flag structurally ambiguous leaders

[branchedelac]

I have a record which starts like this:

=LDR 00760nam a2200253 P 4500 =000 10$aWomack,\J.P. etc

While the presence of the 000 does not appear to actually be causing problems in FOLIO, it disappears from the SRS record if the record is edited and re-saved in QM.

[branchedelac]

As I understand:

• Pymarc -- and seemingly some other ILSs consider the "000" as a regular MARC field with no special characteristics or length restrictions. This is why our tools don't flag it.
• MARCEdit's record structure validation tool interprets the "000" as a Leader field with an invalid length.
• FOLIO's MARC cataloguing tools consider the "000" an invalid MARC field and removes it on import/QM saving.
• FOLIO's OAI PMH harvest simply omits the 000, so it shouldn't hurt any discovery catalog builds using OAI-PMH.