3. Data requirements for delete WorldCat holdings collections

MARC records must contain valid Leader and Directory information in order for a file to be recognized and processed correctly. Please consult the Library of Congress MARC 21 Format for Bibliographic Data for valid Leader and Directory information.

Include

 Note: Certain Leader values will differ depending on whether the submitted data is MARC Bibliographic or MARC Holdings format:

Leader offset	Leader element in MARC bibliographic format	Valid values in MARC bibliographic format		Leader element in MARC holdings format	Valid values in MARC holdings format
00-04	Record length	Computer-generated, five-character number equal to the length of the entire record, including itself and the record terminator. The number is right justified and each unused position contains a zero.		Record length	Computer-generated, five-character number equal to the length of the entire record, including itself and the record terminator. The number is right justified and each unused position contains a zero.
05	Estado de los registros	a, c, d, n, p		Estado de los registros	c, d, n
06	Tipo de registro	a, c, d, e, f, g, i, j, k, m, o, p, r, t		Tipo de registro	u, v, x, y
07	Nivel bibliográfico	a, b, c, d, i, m, s		Posición de carácter indefinida	blank space
08	Tipo de control	blank space, a		Posición de carácter indefinida	blank space
09	Esquema de codificación de caracteres	blank space, a		Esquema de codificación de caracteres	blank space, a
10	Indicator count	2		Indicator count	2
11	Longitud del código de subcampo	2		Longitud del código de subcampo	2
12-16	Base address of data	Computer-generated, five-character numeric string that indicates the first character position of the first variable control field in a record. The number is right justified and each unused position contains a zero.		Base address of data	Computer-generated, five-character numeric string that indicates the first character position of the first variable control field in a record. The number is right justified and each unused position contains a zero.
17	Encoding level	blank space, 1, 2, 3, 4, 5, 7, 8, u, z		Encoding level	1, 2, 3, 4, 5, m, u, z
18	Descriptive cataloging form	blank space, a, c, i, n, u		Item information in record	i, n
19	Multipart resource record level	blank space, a, b, c		Posición de carácter indefinida	blank space
20	Length of the length-of-field portion	4		Length of the length-of-field portion	4
21	Longitud de la porción de posición del carácter inicial	5		Longitud de la porción de posición del carácter inicial	5
22	Longitud de la parte definida por la aplicación	0		Longitud de la parte definida por la aplicación	0
23	Undefined	0		Undefined	0

Additional MARC Leader information

For complete information about the MARC Leader, see:

• http://www.loc.gov/marc/bibliographic/bdleader.html
• http://www.loc.gov/marc/holdings/hdleader.html

Excluir

Please ensure that your submitted UTF-8 MARC data files do not begin with a byte order mark (BOM). MARC data files received with byte order marks will be rejected.

• A byte order mark (BOM) is a sequence of bytes embedded in some Unicode files to help make sure they are read correctly by some web browsers and server environments. The Unicode Standard permits the BOM in UTF-8 (hexadecimal values EF BB BF) but does not require or recommend its use. Byte order has no meaning in UTF-8 and OCLC does not accept UTF-8 encoded files containing BOMS.

MARC records must contain valid field and subfield information in order for a file to be recognized and processed correctly. Please consult the Library of Congress MARC 21 Format for Bibliographic Data for valid Field and subfield information.

Include

Field/Subfield	Field/Subfield name	Requirement
035	Número de control del sistema	Required if available. If available, include an OCLC control number, with valid prefix, in every record.
040 b	Cataloging Source: Language of cataloging	Include a language code if any cataloging data is in a language other than English. If this is not coded, our system will assume the item is cataloged in English.
040 e	Cataloging Source: Description conventions	Include a cataloging description MARC code for rare and archival materials only.
066	Juegos de caracteres presentes	Where this field exists, include 880 fields.
245	Declaración del título	This tag is mandatory. Include the title proper.
5xx	Note Fields	See ** below
880	Alternate Graphic Representation	Where this field exists, include field 066.

**Use UTF-8 Unicode or MARC-8 character encoding. 
 Caution: For all tags, but especially when entering text into text fields (e.g., Comment, Description, etc.):

• Do not add new lines. All text needs to be in one paragraph.
• Do not copy and paste text from Microsoft Word, email, a web browser, or other sources. Pasted text can contain hidden formatting codes which can generate errors.

Tag order

Fields 001, 003, 005, and 035 should be in tag order.

Duplicate records

Each record sent for a single symbol should have a unique local system number in a consistent location. Although this list is not exhaustive, local system numbers are typically found in the following tags: 001, 049, 035, 9xx, and 852.

 Caution: When the system identifies duplicate records or multiple matches in your submitted data sync file, the file will be rerun in an attempt to resolve the issue. Multiple reports and files may be generated for each retry.

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