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Two From the SFX Toolbox: A Plugin and an Target Parser . Rich Wenger, E-resource Systems Manager MIT Libraries. Agenda. Conditional display of Aleph print holdings on the SFX menu. Differential resolution of hdl.handle.net URLs. Part 1. - PowerPoint PPT Presentation
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Two From the SFX Toolbox:A Plugin and an Target Parser
Rich Wenger, E-resource Systems Manager
MIT Libraries
Agenda
1. Conditional display of Aleph print holdings on the SFX menu.
2. Differential resolution of hdl.handle.net URLs.
SFX <=> Aleph | ELUNA 2014Page 2
Part 1.
Conditional display of Aleph print holdings on the SFX menu.
SFX <=> Aleph | ELUNA 2014Page 3
Context
1. We recently completed a redesign of our SFX menu.
2. Our Aleph records have print and electronic holdings on the same record: “piggybacking”.
3. A philosophical change to our handling of Aleph holdings on the SFX menu:
“The American judicial system does not promise justice. It promises a chance at justice” -Paul Newman in The Verdict
SFX <=> Aleph | ELUNA 2014Page 4
Components
1. A modified version of the ALEPH.pm plugin
2. A modified version of the parser for the Aleph target
3. A modified target displayer for Aleph holdings on the SFX menu
4. A modified version of getHolding_ALEPH.tmpl
5. Modifications to the Aleph target
6. A target threshold to avoid looping to/from Aleph
SFX <=> Aleph | ELUNA 2014Page 5
Some Simplifying Assumptions
1. No title searches in AlephSetting in config/aleph_xserver_lookup.config
2. ISSN or ISBN only
3. Suppress “multiple records” message
SFX <=> Aleph | ELUNA 2014Page 6
Plugin ALEPHMIT.pm
1. Based on the standard ALEPH.pm plugin
2. Retrieves the document number from the first call to the Aleph x-server and stores it in the context object
3. Filters e-holdings from the holdings returned from Aleph
4. Reformats the holdings array to consolidate Location and Collection onto one line.
SFX <=> Aleph | ELUNA 2014Page 7
Holdings array
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Barker Library
Microforms v.92 (1970)-v.95 (1973),v.97 (1975)-v.119 (1997)
Library Storage Annex
Journal Collection
v.81 (1959)-v.131:no.1-6 (2009)
Holdings array
SFX <=> Aleph | ELUNA 2014Page 9
Barker Library - Microformsv.92 (1970)-v.95 (1973),v.97 (1975)-v.119 (1997)
Library Storage Annex - Journal Collection
v.81 (1959)-v.131:no.1-6 (2009)
Target Parser ALEPHMIT.pm
1. Based on the standard ALEPH.pm target parser
2. Retrieves the document number from the context object and creates a URL pointing to a specific Full record in Aleph
SFX <=> Aleph | ELUNA 2014Page 10
Target Displayer ALEPHMIT.pm
1. Based on the standard ALEPH.pm target displayer
2. Modifies the holdings array by inserting a blank line ( ) between each set of holdings.
SFX <=> Aleph | ELUNA 2014Page 11
Holdings array
SFX <=> Aleph | ELUNA 2014Page 12
Barker Library - Microformsv.92 (1970)-v.95 (1973),v.97 (1975)-v.119 (1997)
Library Storage Annex - Journal Collection
v.81 (1959)-v.131:no.1-6 (2009)
Template getHolding_ALEPH.tmpl
1. Based on the standard getHolding_ALEPH.tmpl
2. Adds a third variable to the template to accommodate the added line in the holdings array.
3. Example
SFX <=> Aleph | ELUNA 2014Page 13
Part 2.
Differential resolution of handle URLs.
SFX <=> Aleph | ELUNA 2014Page 14
The problem
Some hdl.handle.net URLs resolve to targets that should be proxied e.g. Harvard Dataverse Network,
and some resolve to targets that should NOT be proxied e.g our DSpace instances.
SFX <=> Aleph | ELUNA 2014Page 15
Context
1. SFX must resolve handle URLs differently depending on the target of the resolved handle.
2. Proxying the handle server itself is too big a hammer, too far up stream.
3. We want a decision point when the handle is resolved.
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Components
1. A local target, 856_URL_LCL
2. A local target parser
3. An external script
4. A Display Logic rule
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Local target 856_URL_LCL
1. getFullTxt service
2. Global threshold: $obj->need('856_url') && $obj->need('856_url','=~','/hdl.handle.net/i')
3. Parser: HDL::handle
4. Parse param: ‘external_url=http://library.mit.edu/cgi-bin/handle_url.cgi?parm=‘
SFX <=> Aleph | ELUNA 2014Page 18
Local target parser HDL::handle
1. Retrieves the 856_URL from the context object
2. Retrieves the URL for external script from the parse param.
3. Returns URL for the target in the form:http://<external script>?parm=http:hdl.handle.net/<..>
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External script handle_url.cgi
1. Get and decode the URL from the parm and isolate the handle domain e.g.
http://hdl.handle.net/1721.1/78487
2. If it is one of our DSpace domains, redirect to the handle server.
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External script handle_url.cgi…1. Otherwise, send the handle to the handle server API:
• http://hdl.handle.net/api/1902.1/21446
• Receive and decode the JSON response, and extract the target URL
• Construct a URL for the proxy server and redirect:
http://libproxy.mit.edu/login?url=http://thedata.harvard.edu/dvn/study?globalId=hdl:1902.1/21446
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Display Logic rule
If available target 856_URL_LCL, any service
Do not show 856_URL, any service.
SFX <=> Aleph | ELUNA 2014Page 22
handle_url.cgi
SFX
Aleph OPACBrowser
Z39.50 MARC record fetch
856_URL_LCL
Intl. Country Risk Guide
http://sfx.edu/sfx_local/?title=ICRG&….
856_url: $uhttp://hdl.handle.net/1902.1/21446
handle_url.cgi
hdl.handle.net/api Proxy Server
http://thedata.harvard.edu
Parm=http://hdl.handle.net/1902.1/21446
http://libproxy.mit.edu/login?url=http://thedata.harvard.eduhttp://hdl.handle.net/api/1902.1/21446
Improvements
SFX <=> Aleph | ENUG 2013Page 25
Move the external script logic into the target parser
