subject mapping for OLAC

[dietuyt]

/CMD/Components/OLAC-DcmiTerms?/subject -> subject when multiple subject elements exist, give a preference to (in order of preference):

[@dcterms-type="LCSH"]

ignore (for now, until we have a resolution solution for the numeric codes): [@dcterms-type="DDC"] [@dcterms-type="LCC"]

[dietuyt]

• for the facets, take subject[@dcterms-type="LCSH"] and:

split the string by "--"
add the first 2 elements as a separate facet

eg Tagalog language--Foreign words and phrases--Spanish should become 2
facet values:

Tagalog language
Foreign words and phrases

[dietuyt]

Also, if the subject contains an attribute olac-language that should be mapped on the language facet:

/CMD/Components/OLAC-DcmiTerms/subject[@olac-language] -> language

[dietuyt]

For an overview of all OLAC mappings please see:

​http://trac.clarin.eu/wiki/CmdiVirtualLanguageObservatory#suggestedmappingCMDIOLACprofileVLO2.0fieldsfacets

[herste]

We will solve this in the OLAC XSLT.

[dietuyt]

The LCSH subjects (several terms divided by --) could be processed by the OLAC2CMDI.xsl. However it would result in CMDI files with duplicate lines,eg:

<subject>Tagalog language</subject>
<subject>Tagalog language</subject>

The best way to removed duplicate elements in XSLT is with a postprocessing XSL file, like source:metadata/trunk/toolkit/xslt/comp2schema-v2/cleanup-xsd.xsl

However this complicates the processing of all incoming OLAC records quite a lot as it depends on saxon-specific extensions of XSLT. So we should reconsider doing this during the import process.

[patdui]

The vlo importer ignored double values so:

<subject>Tagalog language</subject>
<subject>Tagalog language</subject>

will result in one facet subject -> Tagalog language.

This:

<subject>Tagalog language</subject>
<subject>Another lang</subject>

will result in two subject facets with different values.

[dietuyt]

I double-checked and with the removal of ​GIAL the last provider with LCSH olac subjects has gone. This ticket is thus no longer relevant (it might be re-opened one day if we get such a provider again).