Z39.50 Batch Search/Overlay API
New API for performing Z39.50 queries for a set of bib records across a
set of Z39 sources. Searches are performed in parallel (up to a
configurable maximum number of active searches and maximum results) and
results are stored in a vandelay MARC Import/Export queue.
Search fields and values are determined by Z39 index field maps. At
search time, the caller provides a set of field maps to use for the
search. Search values for each bib record are found by following the
index maps to the indexed values in metabib.*_field_entry or
metabib.record_attr.
Signed-off-by: Bill Erickson <berick@esilibrary.com>
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