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LIS618 lecture 5

LIS618 lecture 5. Thomas Krichel 2002-10-14. Structure of talk. Nexis.com OCLC firstsearch. Subject directory. you can follow the subject tree but there seems to be only a tiny amount of documents categories are not particularly deep or developed

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LIS618 lecture 5

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  1. LIS618 lecture 5 Thomas Krichel 2002-10-14

  2. Structure of talk • Nexis.com • OCLC firstsearch

  3. Subject directory • you can follow the subject tree but • there seems to be only a tiny amount of documents • categories are not particularly deep or developed • there is a "more like this" feature of limited use, Thomas finds

  4. Power search • source selection, editing is possible • use of connectors is possible here • OR -- AND – AND NOT • PRE/n,n is a number, ordered proximity • W/n,n is a number, unordered proximity • W/S words in same sentence • W/P words is the some paragraph • no use of double quotes for paragraphs

  5. Power search expressions • Parentheses group terms together • * for one or no letter • ! for any number of letters • ATLEAST n(term), where n is a minimum number of occurrences • PLURAL (term) only the plural of term • SINGULAR (term) only the singular of term • ALLCAPS (term) only capitals of term • NOCAPS (term) no capitals of term • CAPS (term) capitalized term only

  6. power search for news • uses power search expressions, plus • hlead (expression) • company (expression) for a company • byline (expression) for the author • show (expression) for a television show transcript

  7. power search for legal data • uses power search expressions, plus • name (expression) for the name of a party • cite (expression) for a citation expression for case law • title (expression) for the title of a law article expression is a Boolean expression

  8. other searches • web searches • news alert • use this to get personal news • do a search, then click on update to get to a screen where you can enter • periodicity • document type • use query language to filter documents

  9. a different query language • terms are implicitly ANDed • explicit AND and OR allowed • phrases have to be put in quotes • * starts for any number of characters, not just one as in power search • parenthesis can be used

  10. Verdict on Nexis • A lot more intuitive than Dialog • Some confusion because three different query languages are used in the basic Nexis service. Some meta characters have different meanings • Seems quite reliable. • Essentially news, contents seems shallow at times. • More full-text, easier to see items.

  11. OCLC lastfind

  12. OCLC FirstSearch • WorldCat • ArticleFirst • Electronic Collections Online • PapersFirst • ProceedingsFirst • UnionLists • MLA Bibliography • GPO government publications

  13. WorldCat • OCLC catalog of books, web resources, and other material worldwide • Contains all the records cataloged by OCLC member libraries • Offers around 50M bibliographic records • Includes records representing 400 languages

  14. types of stuff • books and manuscripts • websites and internet resources • maps • computer programs • musical scores • films and slides • newspapers • journals and magazines • sound recordings • videotapes

  15. simple search • expression • field indicator • keywords (basically anywhere) • author • title (recommend) • limit to type of material (see next slide) • limit to availability

  16. limit to types • basic types • Books -- Serial Publications -- Articles • Visual Materials -- Sound Recordings • Musical Scores -- Computer Files • Archival Materials -- Maps -- Internet Resources   • subtypes • audience • contents • format

  17. subtypes • audience • juvenile -- non-juvenile -- any • contents • fiction – non-fiction –biography –music • non-musical recording –thesis/dissertation • format • large print –braille –microfilm –non-microfilm • manuscript –cd-audio –cassette recording • lp recording –vhs tape –dvd/videodisk • no logic between types and subtypes • no "any" for format subtype

  18. ranking • Number of Libraries is the default • Relevance Records • Data on its calculation are scetchy • Date records is reverse chronological order by year of publication • No ranking records is reverse chronological order by addition to the database

  19. indexed field expansion --Keyword Access –Method --Accession Number –Author --Author Phrase Conference Name --Conference Name Phrase –Corporate Name --Corporate Name Phrase --Descriptor --Descriptor Phrase --Genre/Form Phrase --Geographic Coverage Phrase –ISBN --Language Phrase --Material Type --Material Type Phrase --Named Conference Phrase --Named Corporation Phrase -- Named Person Phrase-- Notes/Comments -- Personal Name --Personal Name Phrase –Publisher -- Publisher Location --Series Title -- Series Title Phrase --Standard Number –Subject --Subject Phrase – Title --Title Phrase

  20. advanced search • has features of basic search with type and subtype listings • search is fielded (see previous slide for fields), up to three Boolean combination in the search terms • publication year range • language (problems with input) • minimum number of libraries

  21. index labels I • Keyword kw:coffee or tea and house+ • Accession number no:37993343 • Access Method am: www oclc org • Author au:saint-arroman • Author phrase au=saint-arroman auguste • Citation cr:magazine index • Conference name cn:canadian

  22. indexing labels ii • Corporate name co:double five • Descriptor de:voice disorders • Dewey class number dd:998.900 • Extended author(s) ea:gershwin ira harburg yip

  23. index terms ii • Extended title et:century events • Genre/Form phrase ge=screenplays • Geographic coverage phrase gc=capetown • Government document number gn:y4p9610w29 • Identifier id:riemann • ISBN nb:3196311821 (omit hyphens) • ISSN ns:4069-6571 (use hyphens)

  24. index terms iii • Language ln=japanese • Library of Congress Call Number lc:hd9000.6 • Library of Congress Control Number nl:map 64-119 rev • Material type mt:vhs • Music number mu:has19832 • Musical composition mc:jazz • Named conference phrase cf=world conference on women

  25. index terms iv • Named corporation phrase nc=intel corporation • Named person phrase na=mandela nelson • National Agricultural Library call number ag:sf223.w47 • National Library of Canada call no.ca:sf209.5 • National Library of Medicine (NLM) call numberlm:asa0011970 • Notes/Commentsnt:translation-adaptation • Personal name pn:lemaire

  26. index terms v • Publisher location pl:china • Report number rn:nofhwap179012 • Series title se:emb report • Series phrase titlese=emb evaluation report • Secondary formatst=bks • Standard numbersn:1092-177 • Subject su:coffee and tea house+ • Subject phrase su=coffeehouses in art • Subject all sa=authors american biography • Subject headings, LC hl:biography

  27. index terms vi • Subject headings, LC children's literature hc:parties • Subject headings, LC children's lit phrase hc=childrens writing • Subject headings, MESH hm:optometry • Subject headings, MESH phrase hm=vision low • Subject headings, NAL ha:fruit • Subject headings, NAL phrase ha=fruit trees • Subject headings, NLC he:photography • Subject headings, NLC phrase he=landscape photography

  28. index terms vii • Subject headings, RVM hr:indiens • Subject headings, RVM phrase hr=politique sanitaire • Subject headings, Sears hs:legends • Subject headings, Sears phrase hs=jewish legends • Title ti:music w3 british w3 enlightenment • Uniform title ut:bible • Unique serial title tk:renew annual report • Universal decimal class no.ud:101-051 • Update Date up:20020101 • Vendor information vn:libros • Year of publication yy:1997

  29. word and phrase indexing • colon means word indexed field • equal means phrase indexed field. • For word indexed fields, there are proximity operators • X w Y (X is followed by Y) • X wi Y (X is followed by Y with at most i terms between) • X n Y (X is next to Y, either order) • X ni Y (X is within i terms of Y, either order)

  30. truncation and wildcards • Use + for plurals (s and es) • Use * for truncation • Use ? for zero to nine additional characters • Use ?i for up to i characters • Use # for a single character, i.e. an abbreviation of ?1.

  31. Boolean operation • you can combine elementary search operations using Boolean operations OR, AND, NOT • a NOT b means a AND NOT b. • there are operator precedence rules, but it is best to rely on parenthesis.

  32. other OCLC databases • search interfaces are almost identical • Verdict: • easy to learn but very powerful query language. • system is fast. • friendly layout • some technical data is missing in the help screens

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