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 [...]

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 [...]

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 [...]

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 [...]

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 [...]

It’s been six months since Diane Hillmann, Jon Phipps, and I published a “level 0″ set of RDF elements (all properties) and value vocabularies based on the MARC21 format. That was largely a mechanical process, as we created a separate property for every combination of tag, two indicators, and subfield for most (but not yet [...]

One continuing theme of the recently concluded DC-2010 is that of the perpetual search for consensus on what the hell DCMI should be doing. I know this continual search for identity is a common phenomenon with this sort of organization, as it is for the human adolescent hovering around the age of 15 years. Like [...]

This morning’s highlight was Stu Weibel’s opening keynote address to the assembled conference attendees (yesterday included primarily workshop sessions and tutorials). Stu was asked to talk about DC’s past and future, and he gave many of us food for thought. The first thing he did was typical Stu—he took a photo of the assembled group. [...]

One of the things that always happens for me after ALA is a compiling of notes and some reflection on what I saw and learned while in the whirlwind of meetings and activities. This year is no different. There were few real surprises—after all, like most of you I keep in pretty good touch with [...]

Corey Harper seems to have started a collection of statements taken out of context, some of which I’ll share here: “If it’s not fish it has to be linked data” –Jennifer Bowen “I’m too far underground to know where I am” –Jon Phipps