F DICOM UL Encoding Rules for Application Contexts, Abstract Syntaxes, Transfer Syntaxes (Normative)
Prev |  | Next

# F DICOM UL Encoding Rules for Application Contexts, Abstract Syntaxes, Transfer Syntaxes (Normative)

## F.1 Encoding Rules

Application Context Names, Abstract Syntax Names, Transfer Syntax Names, and Service Class UIDs are OSI Object Identifiers in a numeric form as defined by ISO 8824. The encoding of these names in the DICOM UL protocol is specified in this Annex.

Each component of a Name or UID is encoded as an ISO 646:1990-Basic G0 Set Numeric String of bytes (characters 0-9). Leading 0's of each component are not significant and shall not be sent. Components shall not be padded. Components shall be separated by the character "." (2EH). "Null" components (no numeric value between two separators) shall not exist. Components with the value zero (0) shall be encoded as (nnn.0.ppp). No separator nor padding shall be present before the first digit of the first component or after the last digit of the last component.

### Note

1. The string "1.2.840.123456.0.21.4" encoded as an ISO 646:1990-Basic G0 Set character string conveys the following UID or Name with the following sequence of Object Identifier components: { (1), (2), (840), (123456), (0), (21), (4) }.

2. The above rules have been made to simplify performing the comparison of UIDs.

DICOM Application Context Names (root plus suffix) shall not exceed 64 total characters (digits and separators between components).

DICOM Abstract and Transfer Syntax Names (root plus suffix) shall not exceed 64 total characters (digits and separators between components).

Prev |  | Next
E.2 Message Control Header Encoding | Home | G Overview of the OSI Layer and Services Concepts (Informative)