[Koha-bugs] [Bug 27365] Koha doesn't check marcxml field size is < 10000 and fails in various places

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=27365

--- Comment #3 from David Cook <dcook at prosentient.com.au> ---
(In reply to Didier Gautheron from comment #2)
> I my understanding it is
> From
> https://www.iso.org/obp/ui/#iso:std:iso:25577:ed-1:v1:en
> 
> In 2001, the U.S. Library of Congress developed a framework for working with
> MARC data in an XML environment. The core of the framework is a MARCXML
> schema that allows lossless round-trip conversion of an ISO 2709 MARC 21
> record and an XML-encoded MARC 21 record.
> 

That's interesting. I'd never heard of ISO 25577. I wonder if anyone actually
uses it. Technically, it's a separate schema from MARCXML, although it looks
like MarcXchange is supposed to be a superset of MARCXML. 

It looks like there's a newer version of ISO 25577:
https://www.iso.org/obp/ui/#iso:std:iso:25577:ed-2:v1:en. 

Here's the MarcXchange XML schema:
https://www.loc.gov/standards/iso25577/marcxchange-2-0.xsd

However neither https://www.loc.gov/standards/iso25577/marcxchange-2-0.xsd nor
https://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd explicitly limits
the length of fields. 

If you look again at the "Scope" section, you'll see the following:

"It does not define the length or the content of individual records and does
not assign any meaning to tags, indicators, or identifiers, these
specifications being the functions of an implementation format."

"Validation of MARC records content is not enforced by the schema but by
dedicated software tailored for the specific usage (e.g. the specific
MARC-format)."

In that way, it seems like the expectation is that you use ISO 2709 with
MarcXChange as well...

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