MARC Batch Edit
---------------

Introduction
~~~~~~~~~~~~

This function is used to batch edit MARC records either adding a field, removing a field or changing the contents of a field. 

.What MARC Batch Edit Can and Can't Do
**************************************
MARC Batch Edit is a powerful tool, but it also has some limitations.
This tool can do the following tasks to a group of MARC records:

* Remove all instances of a specific tag (e.g. remove all 992 tags)
* Remove all instances of a specific tag _if_ a particular subfield
has a particular value (e.g. remove all 650 fields in which the $2
is _fast_)
* Remove all instances of a specific subfield (e.g. remove all 245$h)
* Remove all instances of a specific set of subfields
* Add a field
* Add a subfield to an existing field
* Replace data in a specific field or subfield

It cannot do more advanced tasks, such as:

* Swapping data from one field to another
* Deduplicating MARC records
* Complex logic based on existing data

For more advanced projects, you may wish to export your records and
use a free tool such as http://marcedit.reeset.net/[MARCEdit] or
https://github.com/edsu/pymarc[PyMarc].

**************************************

Setting Up a Batch Edit Session
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Record Source::
This includes options to batch edit identifying MARC records in a record bucket, CSV file or by record id.

Go! (button)::
This button runs the action defined by the rule template(s).

Action (Rule Type)
^^^^^^^^^^^^^^^^^^
Replace::
Replaces the value in a MARC field for a batch of records.
Delete::
Removes a MARC field and its contents from the batch of records.
Add::
Use this to add a field and its contents to a batch of records.

Other Template Fields
^^^^^^^^^^^^^^^^^^^^^
MARC Tag::
This is used to identify the field for adding, replacing, or deleting.
Subfield (optional)::
Indicates which subfield is being edited.
MARC Data::
Use this to indicate the data to add or used in replacing the existing data.

Advanced Matching Restrictions (Optional)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Subfield
Regular Expression::
Using PERL syntax for a regular expression to identify the data to be removed or replaced.

.Running a Template to Add, Delete, or Replace MARC data
. Click Cataloging->MARC Batch Edit
. Select *Record source*
. Select the appropriate bucket, load the CSV file or enter record id depending on *Record source* selected
. Select the *Action Rule*
. Enter the *MARC Tag* with no indicators (eg. 245)
. Enter the *subfields* with no spaces.  Subfields are optional. Multiple subfield can be entered such as _auz_.
. Enter the *MARC Data* which is the value in the fields
. Enter optional *Advanced Matching Restrictions*
.. Subfield
.. Regular Expression (using PERL syntax)
. Click *Go!*
. Results page will display indicating the number of records successfully edited

Examples
~~~~~~~~

Adding a new field to all records
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

. In the _action_ menu, choose _Add_.
. In _MARC Tag_, type the MARC tag number.
. Leave the _Subfields_ field blank.
. In _MARC Data_, type the field you would like to add.

Delete a field if it contains a particular string
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

. In the _action_ menu, choose _Delete_.
. In _MARC Tag_, type the MARC tag number.
. Leave the _Subfields_ field blank.
. In _MARC Data_, type the field you would like to add.
. In the _subfield_ field under _Advanced Matching Restriction_, type the subfield code where you expect to see the string.
. In _Regular Expression_, type the string you expect to see.