Changing Variable-length Fields

Choose Change variable-length field from the Choose Command Type dialog box to open the Change Variable-length Field dialog box.

Using the data you enter in the Find data fields, Global Update locates all of the selected records that contain the specified tag, indicators, and data, and replaces the corresponding data in those records with the tag, indicators, and data you specify in the Replace data fields.

To change variable-length field data:

In the Find text boxes, enter the field group tag, MARC tag, indicators, and data you want to change. The system updates only the fields in the selected records that meet all of the specified criteria.

Using Special Characters in the MARC Tag Data Field

You can use special characters in the MARC Tag data field:

Use commas to separate multiple tags, for example, 240,245.
Use a hyphen to enter a range of tags, for example, 700-730.
Use wild cards to specify a family of MARC tags. The characters 'X', 'x', '?', '*', or '.' are valid. Enter a wild card character at any position in the MARC tag, up to two wild cards per tag. For example, 5** designates all MARC tags in the 500s, including 500, 535, 590, and so forth.

In the Replace data fields, enter the field group tag, MARC tag, indicators, and data you want to replace. The system makes no change to fields with the default value of <no change>.

You can delete all or a portion of the variable-length field data by leaving the Replace Data field blank. The system deletes the field or subfield you entered in the Find Data field. Note that you must enter data in the Find Data field. You cannot search for "existence of a subfield" without specifying contents.

Choose the Use Displayed Field, Match Case, Match Whole Field, and Match Whole Subfield check boxes as desired.

Required Input

You must select (check) the Use Displayed Fieldor make an entry in the Find Field Group Tag or Find MARC Tag field to change variable-length field data.

After specifying the Find and Replace data, choose OK to close the dialog box and return to the Command input tab. The command you created appears as a single line, for example:

The command row includes a Command column and an Action column. The Command column indicates the type of command you specified. (Change = change variable-length field.) The Action column indicates the target data criteria and the data to change in the format target criteria ==> change data. MARC tags appear in parentheses and indicators appear in brackets. A wild card character or word, such as a period ('.'), an equal sign ('='), or <any>, might represent some data fields with unspecified (default) content. Selected options check boxes appear as a letter following a slash at the end of the command:

f	Use Displayed Field
w	Match Whole Field
c	Match Case
s	Match Whole Subfield

In the example above, Global Update identifies all records that have a 650 field, with indicators '<blank>' and '0', containing the data "Music|xTheory" and changes that data to "Music theory." The '.' at the beginning of the command indicates there was no specified field group tag. The '/c' at the end of the command indicates that target records must match the case of the Find data, "Music|xTheory".

To create more change commands, see Creating Commands for Changing Records. Choose the Preview tab to view the effects of your commands. Choose the Process button in the Preview tab to apply the changes.

Options Check Boxes

The following check boxes appear in the Change Variable-length Field dialog box. Select (check) the check boxes to enable the options.

Use Displayed Field: If you retrieved records using an index search, the specified changes apply to all fields corresponding to the displayed field on the Select Records tab regardless of the MARC tag of the field in which the search term occurs. Other limiting specifications on the command input tab can affect the result. For example, a search of the author index may retrieve records in which an author appears both as a personal name main entry (MARC 100) and as a personal name added entry (MARC 700). If you check the Use Displayed Field check box and enter no other command specifications, Global Update changes both the 100 and 700 fields. Be sure to review the Preview tab list to confirm your results before processing.; If you retrieved records using an Advanced Word Search or a review file, the specified changes apply to the field appearing in the browse list of the Select Records tab. For bibliographic records, Global Update displays the Title field by default. To display a different field in the browse list as the target for change, toggle to the desired field.
Match Whole Field: Information in the Find data text box must match the entire field or Global Update makes no change.
Match Case: The text case of the information in the Find data text box must match the text case found in the corresponding record field or Global Update makes no change.
Match Whole Subfield: Information in the Find data text box must match the entire subfield or Global Update makes no change.