UDC (Universal Decimal Classification)
UNX. Classification
Country Classification
Classification and Cutter numbers for biographies
Classification and Cutter numbers for subject dictionaries

Universal Decimal Classification was originally derived from Dewey Decimal Classification (DDC), and managed by the organization now known as the International Federation of Information and Documentation (FID). It was first published in French, from 1904 to 1907. UDC is an indexing and retrieval language for classifying information on all subjects and in all forms.

The following classification schemes have been designed in DHL to serve better management of the DHL collections.

UNX. Classification used for cataloguing materials about the UN. Each UN body has designed number.

Examples:

UNX.1	- UN in general
UNX.12	- UN Charter, text
UNX.15	- UN Security Council
UNX.21	- International Court of Justice (ICJ), etc.

The Call number consists of the collection symbol (Main), the international organization symbol, or the country symbol, the category symbol and two or more digits providing specific identification for the publication by placing it in alphabetical order according to a «Short Cutter». The following «Short Cutter» is currently in use:

2	3	4	5	6	7	8	9
A	E	I	L	O	R	U	Y

The «Short Cutter» is derived from the first digit of the title for official publications and the first digit of the main entry of non-official publication.

Examples:

Jam     Jamaica. Department of Statistics
P26      Building statistics of Jamaica
[for ESA Collection]

Main    
Jam     Jamaica. Department of Statistics
P26      Building statistics of Jamaica
[for Main Collection]

2. General international collective biography is classed in 920, and Cuttered from A 1-3 when no single region is identified.

3. Collective biography of persons in a certain field, national or international, is classified in 920, and Cuttered according to the special Cutter scheme

Examples:

P - politics;
S3 - science;
U5 - United Nations, etc.

Individual biography - 92
1. Individual biographies are classified in 92. The Cutter number is taken from the name of the subject of the biography with the initial letter of the author's name as work mark (except in cases of autobiographies)

Example:

92 B689D

2. For autobiographies, no work mark is required. However, if the author has written more than one autobiography, the initial letter/s of the title as a work mark is added.

Example:

Ref              English-Spanish electrical and computer engineering
413:621.3  dictionary
S74

Cutter numbers for:

Polyglot dictionaries - A1-2
[expanded by author using «Short Cutter» as per Country Short Cutter Scheme]
English dictionaries - A3
[expanded by author, or title when no author exists]
Language dictionaries - A4-Z
[Cutter consists of the first letter of the language, e.g. R - Russian; S - Spanish;      S1 - Sanskrit, etc., according to the list of languages, and is expanded by author, or title when no author exists]