Articles in category 'MARC21 in RDF'

Many of you have heard me say “Time flies, whether you’re having fun or not”–and that has certainly been the case since I got back from the NISO Roadmap meeting a few weeks ago. Somehow, with my head down, I missed part 1 of Roy Tennant’s post “The Post-MARC Era, Part 1: “If It’s Televised, [...]

By Diane Hillmann, May 14, 2013, 4:34 pm (UTC-5)

By-passing taggregations identifies those MARC21 variable data field tags whose level 0 RDF properties, representing individual subfields, can be used generally in data triples and mapping triples without losing information and the semantic coherency of the record. These tags have subfields which are independent of one another, with no need to keep them together if [...]

By Gordon Dunsire, July 18, 2012, 9:44 am (UTC-5)

If we were asked (as we sometimes are) what we’d like to see develop as a result of the BibFrame effort, the emphasis in our answer would have both technical and social aspects. First, given the technologies developing in several different places and considering what we can do now to bring Linked Open Data into [...]

By Diane Hillmann, July 4, 2012, 2:35 pm (UTC-5)

The methodology of treating MARC21 variable data field tags as aggregated statements in RDF is discussed in Taggregations. There are some circumstances when this approach is redundant and level 0 RDF properties based on individual subfields can be used directly in MARC21 data triples that are semantically complete and coherent, and in mapping triples relating [...]

By Gordon Dunsire, June 7, 2012, 8:20 am (UTC-5)

The technique described in Using the sub-property ladder works well to “dumb-up” raw, level 0 data from MARC21 fixed-length data fields to interoperate with metadata from other schemas. Unfortunately, it cannot be used with most MARC21 variable data fields (tags) and subfields. We cannot simply dumb-up a subfield to the level of its parent tag [...]

By Gordon Dunsire, May 20, 2012, 5:08 pm (UTC-5)

I discussed the utility of the sub-property relationship in Getting to higher MARC branches, Netting more MARC fruit, and Adding MARC fruit to the cornucopia. Coincidentally, Bob DuCharme posted Simple federated queries with RDF which outlines the same technique and provides additional information on its use for resource discovery. Those posts are somewhat technical, and [...]

By Gordon Dunsire, May 12, 2012, 1:17 pm (UTC-5)

Why create “a separate property for every combination of tag, two indicators, and subfield”, as I mentioned in Low-hanging MARC fruit? As Karen says in her comment on Getting to higher MARC branches, in the case of the Target audience data element there is no need for the RDF properties defined for each MARC21 “resource [...]

By Gordon Dunsire, April 30, 2012, 3:37 am (UTC-5)

Netting more MARC fruit discussed the use of the rdfs:subPropertyOf property to allow MARC21 data to interoperate with triples based on similar properties in element sets from other metadata schemas. We can show the procedure in action using the Target audience property described in Getting to higher MARC branches. A quick examination of the namespaces [...]

By Gordon Dunsire, April 23, 2012, 4:14 pm (UTC-5)

Getting to higher MARC branches showed how the RDFS subPropertyOf property can be used to entail, or infer, RDF data triples with a broader semantic or meaning than the original, to “dumb-up” or aggregate data based on level 0 properties. Only the property or predicate part of the triple is different; the subject URI and [...]

By Gordon Dunsire, April 20, 2012, 9:39 am (UTC-5)

In the previous blog I discussed Low-hanging MARC fruit in the MARC21 fixed-length data fields 006, 007, and 008. These fields also contain useful data that hangs slightly higher up, but can be reached with a short ladder. The ladder rungs are constructed using the RDF Schema subPropertyOf property. This is an ontological property which [...]

By Gordon Dunsire, April 18, 2012, 9:34 am (UTC-5)