Hi all,
Following up on the subject of facets raised during today's forum, we have
an in-progress wiki page [1] describing some of our faceting goals. The part
of most interest (or the part I'm most interested in feedback on) is the
stuff about data links and how the data is stored in the MARC record.
I'm just going to copy and paste that part.
"""
=== Data Links ===
Many ADS records include links out to several types of data products in
various archives, so a facet indicating data links, as well as the type of
data, is the objective. This means a hierarchical facet display like the
following:
* ARCHIVES (10)
* NED (8)
* Spectra (6)
* Images (2)
* Chandra (2)
To accomplish this using Solr's facet.prefix mechanism we would use a field
called '''archive_facet''', and the indexed values would look like (for one
particular document):
* 0/NED
* 1/NED/Spectra
* 0/NED
* 1/NED/Spectra
* 0/NED
* 1/NED/Images
==== MARC record ====
To store both the archive name and the type of data product we have to get a
little creative with the MARC fields. We propose to store this data in the
'''856''' field using the following subfields:
* '''$u''': the link URL.
* '''$y''': the link title.
* '''$3''': the link type (e.g. DATA or FULLTEXT).
* '''$z''': the archive name joined with the data type, i.e.
"archive:Chandra:Spectra" or "archive:NED:Images". The "archive:" is meant
to act as a namespace in case we have other types of properties in the
future.
* '''$9''': origin/provenance
The Solr indexing process will need to identify these links where the
'''$3''' subfield indicates 'DATA', extract the corresponding '''$z'''
values and format them for indexing as described above.
"""
Any comments or questions about this approach?
thanks,
--jay
[1] http://labs.adsabs.harvard.edu/trac/ads-invenio/wiki/MetadataFacets
--
******************************************************
Jay Luker Astrophysics Data System (ADS)
[email protected] Center for Astrophysics
617-495-4588 60 Garden Street MS 67
617-495-7356 fax Cambridge, MA 02138
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