You set up Indexing MARC maps to extract MARC data from specified tags and subfields so staff and borrowers can search for records in Horizon. Indexing MARC maps put data from extraction tags into an index table on the database. Then, when staff or users do a search, Horizon searches the index table for the MARC information. Many Horizon indexes use Indexing MARC maps to extract MARC information. (Indexes that do not use MARC maps extract data directly from database tables.) For example, a title keyword search option in staff searching uses an index with a MARC map containing all title tags.
You can choose to create a new Indexing MARC map or change an existing one to meet your needs. If you want to create a new one, you can copy and existing one and make changes to the new one you create. Or, you can create a new one from scratch.
Authority-controlled and non-authority controlled fields and subfields may not be combined in the same MARC map. However, you can combine authority-controlled and non-authority controlled keyword indexes in a single search option. In a multisource type index, you can also combine authority-controlled and non-authority controlled fields in browse indexes.
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