skos ecoterm 2006

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Information about skos ecoterm 2006
Product-Training-Manuals

Published on June 19, 2007

Author: Arkwright26

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SKOSEcoterm 2006Alistair MilesCCLRC Rutherford Appleton Laboratory:  SKOS Ecoterm 2006 Alistair Miles CCLRC Rutherford Appleton Laboratory Semantic Web Best Practices and Deployment Reminder: what is it?:  Reminder: what is it? Simple Knowledge Organisation System Formal language for representing controlled structured vocabularies (thesauri, classification schemes, … ?) Subject metadata andamp; information retrieval … ‘this document is about romantic love’. ‘this document is about the cure of tuberculosis by x-ray in India in the 1950s’. Application of RDF Since Ecoterm 2005 …:  Since Ecoterm 2005 … SKOS Core Guide andamp; SKOS Core Vocabulary Specification … First Working Draft May 2005 Second Working Draft October 2005 Minor changes Quick Guide to Publishing a Thesaurus on the Semantic Web … First Working Draft May 2005 What comes next … ?:  What comes next … ? Life after SWBPD-WG … ? Plans for next phase of W3C Semantic Web Activity … New WG? SKOS W3C Recommendation by end 2007? N.B. Not yet approved! If Rec then …:  If Rec then … What is the scope? What is the fundamental design goal? First part of SKOS Rec would be requirements specification. Between now and Sept/Oct 2006 … define scope and requirements. What I’d like to do here …:  What I’d like to do here … Talk about some of the assumptions behind SKOS. Sketch some ideas on how to define scope and requirements for SKOS. Get your feedback. public-esw-thes@w3.org 'SKOS: Requirements for Standardization' isegserv.itd.rl.ac.uk/public/skos/press/dc2006/paper.pdf Brief history of scope …:  Brief history of scope … 2003-04: SWAD-Europe ISO 2788 thesauri 'Non-standard' thesauri via extensibility e.g. GeMET Classification scheme (PACS) Multilingual thesauri Semantic mapping 2004: W3C Glossaries 2005: Discussion re 'terminologies' Subject headings? Gazeteers? Folksonomies? Taxonomies? Assumptions: purpose …:  Assumptions: purpose … Formal representation of controlled structured vocabularies intended for use in information retrieval applications. Assumptions: workflow …:  Assumptions: workflow … Build a vocabulary Build an index Retrieve Assumptions: components …:  Assumptions: components … Vocabulary Development Application Something to help build a vocabulary Indexing Application Something to help build an index Retrieval Application Something to help retrieve things SKOS ultimately designed to support interoperation of these three 'key components'. Proposed scope …:  Proposed scope … SKOS is a formal language for representing controlled structured vocabularies intended for use within information retrieval applications. SKOS is required to support the interoperation of these three key components. I.e. define the requirements for SKOS by describing a set of functionalities that must be enabled. Other components …:  Other components … Vocabulary mapping … ? Metadata registries … ? … ? Component specs …:  Component specs … … first discuss social and technological context, then return to component specs … Context …:  Context … What is the social and technological context in which controlled structured vocabs are used? Assume two basic needs… Locate something I already know about. Discover something new. N.B. a good location service is not necessarily a good discovery service. Cf. Google and del.icio.us Strategies …:  Strategies … Basic strategies for implementing retrieval services … Statistical text analysis Analysis of user behaviour Index with controlled vocab Other strategies … … kos-assisted text analysis? Cost problem …:  Cost problem … Given that applying controlled structured vocab for retrieval involves significant initial and ongoing investment… Given that other strategies are cheaper… Huge pressure to drive down cost and increase utility. Requirement for seamless integration. I.e. controlled vocab is seldom used in isolation, most applications will combine strategies. Use case …:  Use case … Search portal … Use combined strategies. Component specs …:  Component specs … Important factors … Minimise cost. Decentralisation. Assistance. Maximise 'utility'. Query expansion. Smart ranking. Maximize lifetime. Use the Semantic Web! Situation A. search across many collections, where indexers use same controlled vocab. Situation B. search across many collections, where indexes use different controlled vocabs. Focus areas …:  Focus areas … Decentralisation requires different models of collaboration and change. Representing change a key factor to keeping a vocab applicable. Ranking and scoring well understood for text, less so for controlled index. Theory of query expansion? Field trials of query expansion? Strategies for providing assistance? Change and collaboration:  Change and collaboration Continuum of collaboration models: centralized andlt;-andgt; decentralised Continuum of change management models: continuous andlt;-andgt; discrete Decentralization can reduce cost of development and maintenance Change management can ensure continued utility – maximize ROI Support for declarative representation of change a requirement for SKOS. Semantic Web architecture…:  Semantic Web architecture… Exploit Semantic Web facility to distribute and merge data. However, publication of data in the Semantic Web, best practices need work. See 'Best Practice Recipes for Publishing RDF Vocabularies' W3C Working Draft (Google 'publishing RDF'). Semantic Web architecture:  Semantic Web architecture Direct interaction …:  Direct interaction … Information retrieval…:  Information retrieval… Indexing and query evaluation well understood for text content. Less well understood for controlled metadata. Query types? Query evaluation strategies, e.g. query expansion? Ranking? Assistance for indexers …:  Assistance for indexers … Provide suggestions Comparison of labels and annotations Machine learning Exploit lexical resources … ? Assistance for mappers …:  Assistance for mappers … Provide suggestions … Analysis of labels and annotations Exploit lexical resources … ? Summary:  Summary SKOS: fundamental requirement to support information retrieval using controlled structured vocabularies. Define requirements by describing information retrieval functionalities. Divide functionalities into: Presentation styles Query types e.g. compound queries, coordination … Query evaluation strategies Assumptions: Key components Semantic Web interaction Context – pressure to make vocabularies 'profitable' … Issues: change, assistance, theory …

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