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It is therefore advisable to write a small program to extract information from these 9XX fields to construct the CSV formatted file to load the data into the holding and item tables. This program would parse the MARCXML converted from the MARC file and extract crucial item and holding data. The program can also be used to manipulate Bib data - replace Control Field 001, remove duplicate Control Field 003, move the alpha numeric Control Field 001 to a 9XX field, etc.
An alternate way of loading MARC records is through Webservice APIs. More detailed information along with sample request XMLs can be found here.