Text to go in the release notes:
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This enhancement adds a UNIMARC plugin (unimarc_field_009_ppn.pl) that uses sudoc.fr web services (isbn2ppn, issn2ppn, ean2ppn) to search for the Sudoc record identifier (PPN) using the ISBN, ISSN, or EAN identifiers as the search criteria. The plugin expects the ISBN in 010$a, ISSN in 011$a, and EAN in 073$a.
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