3. Data requirements for delete WorldCat holdings collections
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Data synchronization allows for the processing of multiple file formats. In order to ensure your files are processed correctly, please follow the data requirements below.
Note: MARC data is required for all bibliographic collections.
Leader and Directory
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.
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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
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For complete information about the MARC Leader, see:
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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.
Fields and subfields
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.
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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.