6.6 PS3.6: Data Dictionary
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## 6.6 PS3.6: Data Dictionary

PS3.6 of the DICOM Standard is the centralized registry that defines the collection of all DICOM Data Elements available to represent information, along with elements utilized for interchangeable media encoding and a list of uniquely identified items that are assigned by DICOM.

For each element, PS3.6 specifies:

- its unique tag, which consists of a group and element number,

- its name,

- its value representation (character string, integer, etc),

- its value multiplicity (how many values per attribute),

- whether it is retired.

For each uniquely identified item, PS3.6 specifies:

- its unique value, which is numeric with multiple components separated by decimal points and limited to 64 characters,

- its name,

- its type, either Information Object Class, definition of encoding for data transfer, or certain well known Information Object Instances,

- in which part of the DICOM Standard it is defined.

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