DICOM PS3.5 2016b - Data Structures and Encoding

7.4.5 Type 3 Optional Data Elements
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### 7.4.5 Type 3 Optional Data Elements

IODs and SOP Classes define Type 3 Data Elements that are optional Data Elements. Absence of a Type 3 element from a Data Set does not convey any significance and is not a protocol violation. Type 3 elements may also be encoded with zero length and no Value. The meaning of a zero length Type 3 Data Element shall be precisely the same as that element being absent from the Data Set.

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7.4.4 Type 2C Conditional Data Elements | Home | 7.4.6 Data Element Types Within A Sequence

DICOM PS3.5 2016b - Data Structures and Encoding