1 / 10

Lab : Reference Linking

CS 502 Computing Methods for Digital Libraries Cornell University – Computer Science Herbert Van de Sompel herbertv@cs.cornell.edu. Lab : Reference Linking. Access to PC orpcuser orpcpw. Assignment 3: validation of OAI protocol requests. Identify request BASE-URL?verb= Identify

myrna
Download Presentation

Lab : Reference Linking

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CS 502 Computing Methods for Digital LibrariesCornell University – Computer ScienceHerbert Van de Sompelherbertv@cs.cornell.edu Lab : Reference Linking Access to PC orpcuser orpcpw

  2. Assignment 3: validation of OAI protocol requests • Identify request • BASE-URL?verb=Identify • ListMetadataFormats request • BASE-URL?verb= ListMetadataFormats • ListSets request • BASE-URL?verb= ListSets • ListIdentifiers request • BASE-URL?verb= ListIdentifiers & from=YYYY-MM-DD • & until=YYYY-MM-DD • GetRecord request • BASE-URL?verb= GetRecord & identifier=xxxxxxx • & metadataPrefix=xxxxx • GetRecord request • BASE-URL?verb= ListRecords & from=YYYY-MM-DD • & until=YYYY-MM-DD • & set=setSpec

  3. OAMH protocol replies • Real OAMH reply (XML document conforming to defined Schema) for legal protocol requests; • HTTP Status-Code 400 for illegal protocol requests: • Illegal verbs are used in the request; • Illegal arguments are used in the request: • The argument itself is illegal as such; • The argument is illegal in conjunction with a certain verb; • Illegal values are used for valid arguments • BUT: it seems to be a mess out there!

  4. Formalize the notion of legal protocol requests • It is possible to transform a GET URL with &-delimited name=value pairs into an XML instance document: • http://an.oa.org/request?verb=ListRecords&from=12-01-1999&until=14-01-1999&set=theset&metadataPrefix=oai_dc <?xml version="1.0" encoding="UTF-8" ?> <oai-request namespace_stuff schemalocation_stuff> <ListRecords> <from>12-01-1999</from> <until>14-01-1999</until> <metadataPrefix>oai_dc</metadataPrefix> <set>theset</set> </ListRecords> </oai-request>

  5. Formalize the notion of legal protocol requests • It is possible to create an XML Schema that defines which XML instance documents correspond with legal protocol requests. (how stringent can the Schema be?) … <element name=“oai-request" type="oai:requestType"/> <complexType name=" requestType"> <choice> <element name=“Identify" … /> <element name=“ListRecords" … /> <element name=“ListMetadataFormats" …/> ….. </choice> </complexType> …

  6. Formalize the notion of legal protocol requests • Using: • such XML instance documents • the XML Schema • It is possible to check the validity of the XML instance documents against the XML Schema • XML document validates => Legal protocol request • XML document does not validate => Illegal protocol request • The rest: see Assignment 3

  7. Exploring reference linking solutions – PubMed LinkOut • PubMed & LinkOut • http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi • Publishers, Aggregators, Libraries provide links in XML documents to PubMed • PubMed loads these links into the LinkOut linking database • Users can set Linkout preferences using the cubby

  8. Exploring reference linking solutions – OpCit project • OpCit • http://arabica.ecs.soton.ac.uk/cgi-bin/access_pdf • PDF versions of arXiv preprints are parsed for references (dynamic or static) • References are identified; essential information is extracted and put on an actionable URL • the URL points at a linking server • in the demo this linking server is dedicated to arXiv linking • it could point at an OpenURL-compliant service component • Two interfaces: • Reference link only (SFX off) • Extended services (SFX on)

  9. Exploring reference linking solutions – OpenURL SFX • Ghent environment • Use Netscape • Go Edit => Preferences => Advanced => Proxies • Choose “manual proxy configuration” • sfxserv.rug.ac.be • 33334 • http://sfxserv.rug.ac.be/execl_eng.cgi • name: cs502 • pass: lab13 • Pick a database – BIOSIS, Inspec, Medline, Current Contents

  10. Exploring reference linking solutions – PeP • Perspectives in Electronic Publishing • Use Internet Explorer • go http://aims.ecs.soton.ac.uk/Pep.nsf/ • Click Open Links Session • Downloads a linking database to your PC • Wherever you travel terms that are in the linking database will become clickable

More Related