Qualified Dublin Core Using RDF for SciTech Journal Articles DC2001 International Conference on Dubl

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Qualified Dublin Core Using RDF forSci-Tech
Journal ArticlesDC-2001International
Conference on Dublin Core and Metadata
Applications, October 22-26, 2001National
Institute of Informatics, Tokyo,
Japanhttp//dli.grainger.uiuc.edu/Publications/D
C2001/

• Thomas G. Habing (thabing_at_uiuc.edu)
• Timothy W. Cole (t-cole3_at_uiuc.edu)
• William H. Mischo (w-mischo_at_uiuc.edu)
• University of Illinois at Urbana-Champaign

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History and Objectives of the Testbed

• Funded 1994-98 under DLI-I (NSF/NASA/DARPA).
• Continued 1998-2001 under CNRIs D-Lib Test
  Suite.
• Construct large-scale, multi-publisher,
  markup-based full-text journal testbed.
• Investigate processing, indexing, normalization,
  retrieval, rendering and linking.
• Study end-user searching behavior and needs.

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Description of Testbed

• Testbed contains 65,000 articles from 50
  journals.
• Received from publishers as SGML (various DTDs).
• Converted to well-formed XML.
• Content support from AIP, APS, ASCE, IEE, ASM,
  ACM, Elsevier.
• Additional support from IEEE, NRL, NTT Learning
  Systems.

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Usage of Metadata in Illinois Testbed

• Facilitate resource discovery across
  heterogeneous sources through normalization.
• Common, easily displayable search results.
• Add value to the original object reference
  linking, links to alternate formats and A I
  services.
• Data exchange, as with Open Archive Initiative
  Protocol for Metadata Harvesting (OAI PMH).

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Metadata Extraction Process

• Metadata is derived from full-text using XSLT.
• One-to-one mappings.
• select//titlegrp/title maps to ltdctitlegt.
• Complex mappings
• Tables of Contents, Literal Markup such as
  MathML.
• Advanced XSLT techniques
• JavaScript functions are used for some
  formatting.
• The document(url) function is used to merge XML
  from other sources, such as CrossRef, into the
  metadata.
• See paper for sample XSLT code.

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Other uses of XSLT

• Dumb-down to unqualified DC.
• Transform metadata to HTML for display.
• Generate RDF triples for use in a RDBMS.

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Dumb-down XSLT

• ltxslvariable name"DCQ" select"document('dcq.rdf
  s')"/gt
• ltxsltemplate name"dumb_down_dcq"gtltxslvariable
  name"SubPropertyOf select"DCQ//rdfProperty
  _at_rdfIDlocal- name(current())/rdfssubProper
  tyOf/_at_rdfresource"/gtltxslvariable name"DCTag"
  select"substring- after(SubPropertyOf,'xmlns
  _dc')"/gtltxslif test"DCTag"gt
  ltxslcall-template name"dumb_down"gt
  ltxslwith-param name"Tag" select"DCTag"/gt

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Local Extensions to DCQ

• Qualified DC was not adequate for our needs.
• Various DC working groups provided some guidance.
• We extended DCQ in three areas
• Citation-related extensions.
• Agent-related (creator) extensions.
• Type and encoding scheme extensions.

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Citation-related Extensions

• ltuiLibcitationgtA. Author. "A Title" Some Jrnl.
• ltdcidentifiergt ltuiLibOpenURL-OBJECT-METADATA-
  ZONEgt ltrdfvaluegtgenrearticleampaulastAu
  thor
• ltdcqisPartOfgt ltrdfDescription
  rdfID"JournalIssue"gt ltdcidentifiergtltuiLib
  ISSNgt ltrdfvaluegt1234-5678lt/rdfvaluegt
  lt/uiLibISSNgtlt/dcidentifiergt
  ltdctitlegtSome Journallt/dctitlegt

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Agent-related Extensions

• Based on DC Agent Qualifiers, Working Draft.
  1999.
• ltdccreatorgtltrdfSeqgtltrdfligt ltdcaPerson
  rdfID"AUTHOR-1"gt ltdcaagentnamegtltdcaFNFgt
  ltrdfvaluegtAuthor, A. N.lt/rdfvaluegt
  lt/dcaFNFgtlt/dcaagentnamegt
  ltdcaagentaffiliationgtBig
  Universitylt/dcaagentaffiliationgt
  ltdcaagentidentifier rdfresource"mailto
  ana_at_big.edu"/gt

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Type and Encoding Extensions

• Extensions to DCMI Type Vocabulary.
• ltdctype rdfresource "http//dli.grainger.uiu
  c.edu/uiLibbook"/gt
• ltdctype rdfresource "http//dli.grainger.uiu
  c.edu/uiLibinjrnl"/gt
• Additional Encoding Schemes.
• PACS, ACMCCS, ISSN, CODEN, ACM_JRNL_CODE.

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Conclusions

• Using DCQ/RDF for sci-tech journal articles is
  viable
• Steep learning curve for RDF
• Dumbing-down DCQ/RDF is complex
• Cannot ignore non-DC tags, RDF Schema is required
• DCQ is missing many properties and types required
  for complete serials descriptions
• Utility of RDF remains uncertain