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NERC DataGrid Vocabulary Governance Vocabulary Workshop, RAL, February 25, 2009
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NERC DataGrid Types of Governance Content Governance Determines the concepts to be included in controlled vocabularies and their labels (URIs, text terms and definitions) Technical Governance Storage, versioning and serving of controlled vocabularies
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NERC DataGrid Types of Governance Content Governance The history of oceanographic data management is littered with examples of poor vocabulary content governance Decisions made by individuals – even students Decisions taken with inadequate thought Definitions conspicuous by their absence Lazy governance (saying “yes” to all requests)
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NERC DataGrid Types of Governance Content Governance As a consequence we have ‘governed’ international list problems. Consider the so- called ‘ship codes’. We have: Two hulls with the same URI because they had the same name Well-known vessels wiped from metadata because they changed name Inclusion of ‘Helicopter’ and ‘Route: Folkestone - St. Malo/Boulog’ in the vocabulary
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NERC DataGrid Types of Governance Content Governance Models Benign dictator Can work, but doesn’t scale and what happens if the dictator goes under a bus? Moderated caucus Commonly adopted based on e-mail list servers and can work well Risks associated with the model –Caucus apathy –Caucus intransigence or moderator too weak –Moderator overload (tooling can help) –Moderator too strong Formal committee Very slow Constitution can be a source of problems (no veto!!)
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NERC DataGrid Types of Governance Technical Governance The history of oceanographic data management is littered with examples of poor vocabulary technical governance Multiple copies –One site served two versions of a list »Both were different »Neither was the master Weak management –Scrappy files scattered over several FTP sites –Local copies taken –Like Galapagos finches these evolve becoming similar but significantly different No version labelling or timestamps –Evolving local copies had no idea how they related to their origin
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NERC DataGrid Types of Governance Technical Governance Models Feature Type Catalogue Designed for GIS world Working model specified in ISO19135 Equally applicable to vocabularies NDG Vocabulary Server follows 19135 in outline, but not detail (particularly their terminology) Ontology Repositories Ingestions of OWL files MMI operate one based on Drupal security Ontology download as files or SPARQL query interface
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NERC DataGrid Types of Governance Technical Governance Models Community distribution sites Community managed collection resources Simple catalogue of resources to download as files OBO is a classic example Vocabulary server Terms and lists given URLs URLs serve XML documents May also provide API access
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NERC DataGrid Governance Best Practice Content Governance Do’s and Don’ts Do process requests for change as quickly as possible Do ensure that change requests don’t redefine the collection Do establish managed deprecation Do insist on definitions for terms Don’t change the semantics mapped to a URN Don’t delete concepts
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NERC DataGrid Governance Best Practice Technical governance Do’s and Don’ts Do provide on-line access to the latest version Do provide URIs to concepts and collections Do provide access to previous versions Do empower content governance with tools Do provide both clients and service APIs Don’t allow URNs to change Don’t make unnecessary change to URLs
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NERC DataGrid NDG Governance Model Each list is allocated a content governance authority These include BODC internal governance SeaDataNet Technical Task Team SeaVoX (Intergovernmental Oceanographic Commission caucus) ICES CF Standard Names Committee NASA Global Change Master Directory International Hydrographic Bureau ISO
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NERC DataGrid NDG Governance Model Technical governance is delivered by the Vocabulary Server This has two content update models Governance authority contacts BODC requesting change (e.g. CF) BODC monitors governance authority outputs making changes when these change (e.g. GCMD, ISO) Changes made by BODC staff This doesn’t scale, so we need a…
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NERC DataGrid NDG Governance Model Vocabulary Editor Governance authority designates individuals who will make change Authentication identifies these individuals Authorisation determines which lists in the server portfolio they are allowed to modify Web-form tool API to allow edit functionality to be built into other tools Currently under construction
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