791: Linked Data in Libraries

Metadata Retrieval and Harvesting


The purpose of this exercise is to familiarise you with the experience of querying a web service or linked data source for information.


Create a set of 3-4 queries in SRU/CQL, SPARQL, OAI-PMH, Z39.50 or another query language for an existing metadata database (web service) or linked data source.


Your first step should be to identify the particular query language used by the system (or languages, some offer support for multiple languages) and then read any documentation provided by the web service or conduct a few searches using the web form in order to learn the syntax of the query structure.


Submit the 3-4 queries. For each query, provide a brief description of what the query is supposed to do, and provide the output you received when running the query (or a single example record and summary of the rest of the output if the output is longer than a page).


Some examples of web services or linked data sources:


Service

Query Language/API

URL

Pubmed

Entrez

http://www.ncbi.nlm.nih.gov/pubmed

base url for efetch: http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?

base url for esearch: http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?

dbPedia

SPARQL

http://dbpedia.org/About

base url: http://dbpedia.org/snorql/?

Pubmed Central

OAI-PMH or Entrez

http://www.ncbi.nlm.nih.gov/pmc/

see Pubmed for base urls for Entrez

base url for OAI-PMH: http://www.pubmedcentral.nih.gov/oai/oai.cgi

arXiv.org

OAI-PMH

http://arxiv.org/

for examples see: http://arxiv.org/help/oa/index

base url: http://export.arxiv.org/oai2?

Library of Congress

SRU, Z39.50

http://www.loc.gov/z3950/lcserver.html

base url: http://z3950.loc.gov:7090/voyager?

National Library of Austrlaia

SRU

http://trove.nla.gov.au/

for examples see:

http://trove.nla.gov.au/general/aboutPeople

base url for SRU: http://www.nla.gov.au/apps/srw/search/peopleaustralia

Amazon.com

web query

http://www.amazon.com/

base url: http://www.amazon.com/s/ref=nb_sb_noss?

List of OAI-PMH Data Providers

all OAI-PMH

http://www.openarchives.org/Register/BrowseSites


List of SRU Servers

all SRU

http://www.loc.gov/standards/sru/resources/servers.html

or

http://www.loc.gov/standards/sru/resources/implementors.html

Library of Congress List of Z39.50 Gateways

Z39.50

http://www.loc.gov/z3950/agency/

for examples see: http://www.indexdata.com/blog/2009/08/z3950-dummies

or http://www.collectionscanada.gc.ca/amicus/006002-400-e.html