RDF in Hydra Q and A - Emory
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IDQuestionNotesAnswerStatus
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Q1What are the most compelling benefits/use cases for switching to RDF?Confirm the predicate switching use case - much easier than reserializing MODS mappings?
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Q2How hard is it to re-serialize RDF-based metadata to static XML as needed for view/export (e.g. OAI; METS) out of Hydra?E.g. for aggregation, sharing with partners
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Q3How do we map MODS/XML datastreams to RDF when migrating?We have a lot of legacy MODS xml datastreams.
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Q4What does RDF XML output from a Hydra object look like? What is the syntax for this?
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Q5At what point are RDF predicates validated in the Hydra stack? When do you encounter validation errors? Does RDF even validate against namespaces or is it just looking at pure syntax only?
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Q6How would we we store a range of dates?
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Q7Are there technical performance issues to be aware of regarding XML vs. RDF?
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Q8How do you encode nested properties (e.g. MODS identifier@type) in a Hydra data model? Blank nodes etc?Fedora 4 does not support blank nodes?
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Q9Does Fedora 4 use RDF natively for its reserved datastreams? Is FOXML still used? RELS-EXT and RELS-INT?
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Q10Are other Hydra adopters reverting to using local namepaces as workarounds? If so, what are they?Is there a Hydra community effort to make a re-usable namespace?
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Q11In a Hydra model, for a given property can we mix a use of literals and URIs in values or does it have to be one or the other? Is that controlled by the model or the form UI?
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Q12What does it mean that most of the vocabularies listed at https://github.com/ruby-rdf/rdf/tree/develop/lib/rdf/vocab say they "will be deprecated in RDF.rb 2.0."?
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Q13If we go RDF, will the RDF be stored in the same manner as RELS-EXT is currently? If so is it stored in a triple store?
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Q14Can we get an example of how to use MODS in Hydra as it is defined in RDF:vocab?Confirm that the properties established there can be used like any other RDF::vocab or RDF::ruby? Assume these are a "flat" subset available for use?
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Q15Can we use the same DC mapping 2x in a Hydra model? E.g. use dc:subject but store both keywords and controlled entries?Not sure we'd want to do this, but it's an interesting question
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Q16Assume we can use RDF in Hydra whether or not we configure a LDP for Fedora 4?We don't have a firm plan for LDP yet.
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Q17How are people using RDF to describe complex, hierarchical objects?
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