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MODS  March 2002

MODS March 2002

Subject:

Re: Documentation and subject headings

From:

"Houghton,Andrew" <[log in to unmask]>

Reply-To:

Metadata Object Description Schema List <[log in to unmask]>

Date:

Wed, 27 Mar 2002 12:00:10 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (86 lines)

> From: Geoff Mottram [mailto:[log in to unmask]]
> Sent: Wednesday, March 27, 2002 11:08 AM
>
> I came across a
> statement about how subject headings might be entered that
> made me realize
> there is much about MODS I don't understand. In your email
> you mention:
>
>> "2. MODS offers a lot of flexibility in terms of how
>> specific you
>> want the
>> markup to be (e.g. you can subfield the elements of a subject
>> heading or
>> just use an LCSH string). That will allow for different
>> methods of input
>> depending upon the expertise of the person creating the
>> record. It will
>> also serve us well as a preliminary catalog record if we can
>> receive the
>> more detailed encoding."
>
> I happen to disagree with you on this. I don't see why a
> MODS record should
> support both forms of a subject entry (as a single XML
> element with dashes
> or as a series of XML elements without dashes). If a user is
> capable of
> typing in those double dashes, they can just as easily split
> out the subject
> into sub-elements. This is another example of MODS trying to
> make too many
> people happy and the end result is a system that will be difficult for
> machines to process when you are done. MODS subjects should
> be required to
> be sub-divided in cases where a user would have input dashes.

I agree here. The subdivisions of a subject headings should be
separately marked up. As I indicated earlier in a previous post,
nobody should have to parse data content to derive meaning. This
is what markup is all about. Appropriately markup the data to
indicate its meaning. In places where AACR2 doesn't cut it,
markup the data further.

On a second point here. When dealing with subject headings you
should not be copying the subject headings from established
vocabularies, like LCSH. This is the MARC21 way of doing it,
and it cause all sorts of problems. For example, LC changes the
subject heading and the data is no longer correct in the record,
or the cataloger miss-types the data and you cannot find the
corresponding subject heading in the authority file. Please use
the XLink standard for pointing to established vocabularies. The
XLink standard can also be used for ad hoc subject terminology
that is not related to established vocabularies.

> This brings me to a second point. I believe I now know why
> you are getting
> so little feedback on MODS and why I often have to drag
> myself to critique
> it: because your MODS web site lacks a document like the MARC concise
> formats to describe in English how each MODS element is
> applied. Pouring
> over the schema (and I suspect that many other subscribers to
> this list know
> as little about XML schemas as I do) and example records is
> too much like
> having to interpret ancient texts and trying to divine the
> author's intent.

I'm in agreement here as well. If LC wants people to use this
standard then they need to provide the explicit mapping from MARC21
fields/subfields/AACR2 to MODS along with mapping guidance. Placing
disclaimers on the Web Site saying its up to others to develop the
business rules is not adequate. For example, without any guidance,
OCLC and RLG most likely will develop different business rules for
mapping. Thus creating additional problems for adoption and
interoperability.

The fact that this project is going ahead before any serious review
of the MODS schema, seems to say to me, that LC is not interested
in comments. There are other problems with the schema, especially
in regard to Dewey Decimal Classification identifiers.


Andy.

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