856 Item creation

[wafschneider]

From @ntra00:

I think there’s a problem with 856s.

http://lx2.loc.gov:210/LCDB?query=rec.id=10063988&recordSchema=bibframe2&maximumRecords=1

http://id.loc.gov/tools/bibframe/compare-id/full-ttl?find=10063988

http://id.loc.gov/tools/bibframe/compare-id/full-rdf?find=10063988

The Work has an instance for the 856 (856-22). And it has an Instance for the main Instance,(#Instance).

The 856 instance embedded in the work has an item for itself, (#Item856-22")

On the main instance, there are 2 hasItems, Item050-13" and and Item for the 856 again. (#Item856-22")

I think that’s wrong, and the 856 Item should only be on its own instance. I have not checked the spec.

Thanks,Nate

[wafschneider]

It definitely seems wrong -- the same Item record is created twice. The 856 in question is:

<datafield tag="856" ind1="4" ind2="1">
<subfield code="u">http://hdl.loc.gov/loc.gdc/scd0001.00147517178</subfield>
</datafield>

The spec deals with ind2 values of #, 0, 8, and 2 -- but not 1 ("Version of resource"). I will check with Sally as to whether this represents a new Instance of the Work or if it is just an Item on the main Instance generated by the work.

[wafschneider]

Sally has proposed the following change to process 3.2 which will resolve the problem if implemented:

3.2) If 856 Ind2 = # or 0 or 1 or 8 According to MARC 856, i2=1 is an electronic version of an analog resource described in the record, so the BF description would have an Instance for the analog and then a new Instance for the electronic version specified in 856. It would always, if the data is correct, fall in the second group about when the Instance is NOT electronic.

[wafschneider]

I think this was an implementation as well as a specification error (or maybe the spec changed without the change getting to the converter?). It is specified that an record describes an electronic resource if 008/23 = "o" or "s". The conversion script used 007/00 = "c" or 008/23 = "q" or "s" -- which is why the item was created on both Instances, rather just on the Instance created by the 856 in the sample record.