F.3.2 Modules of the Basic Directory Information Object
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### F.3.2 Modules of the Basic Directory Information Object

Attributes of the Basic Directory IOD are defined with a Type designation that indicates if a specific Attribute is required for all Media Storage Operations (see Chapter 5).

#### F.3.2.1 File-set Identification Module

Table F.3-2. File-Set Identification Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
File-set ID | (0004,1130) | 2 | User or implementation specific Identifier (up to 16 characters). For definition, see PS3.10. The File-set ID is intended to be a short human readable label to easily (but not necessarily uniquely) identify a specific File-set to facilitate operator manipulation of the physical media on which the File-set is stored. Assignment of Value and semantics are environment specific.
File-set Descriptor File ID | (0004,1141) | 3 | ID of a File (in the same File-set) used for user comments related to the File-set (e.g., a README file). The Specific Character set used may be specified in the Specific Character Set of the File-set Descriptor File (0004,1142). ### Note This File is not DICOM formatted (no Preamble, nor DICM Prefix and Meta Information).
Specific Character Set of File-set Descriptor File | (0004,1142) | 1C | Character set used in the File-set Descriptor File with a File ID as specified in File-set Descriptor File ID (0004,1141). Required to specify the expanded or replacement character set. If absent, only the Basic Graphic set is used. See Section C.12.1.1.2 for Defined Terms.

### Note

Every File-set is assigned a File-set UID when created. The File-set UID need not be duplicated as a Type 1 Attribute of the File-set Identification Module. It is conveyed as the SOP Instance UID of the Basic Directory IOD. It is included in the DICOMDIR File Meta Information (see PS3.10)

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