C.10.8 Waveform Identification Module
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### C.10.8 Waveform Identification Module

The table in this section contains Attributes that identify a Waveform as a separate information entity.

Table C.10-8. Waveform Identification Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Instance Number | (0020,0013) | 1 | A number that identifies this Waveform.
Content Date | (0008,0023) | 1 | The date the Waveform data was created.
Content Time | (0008,0033) | 1 | The time the Waveform data was created.
Acquisition DateTime | (0008,002A) | 1 | The date and time that the acquisition of data that resulted in this waveform started; the reference timestamp for the Multiplex Group Time Offset (0018,1068) for a waveform multiplex group ### Note The synchronization of this time with an external clock is specified in the Synchronization Module in Acquisition Time Synchronized (0018,1800).
Referenced Instance Sequence | (0008,114A) | 3 | Composite SOP Instances that are significantly related to this Waveform. One or more Items are permitted in this sequence.
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
>Purpose of Reference Code Sequence | (0040,A170) | 3 | Code describing the purpose of the reference to the Instance(s). Only a single Item is permitted in this sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Defined CID 7004 “Waveform Purposes of Reference” for referenced waveforms.

### Note

Acquisition DateTime (0008,002A) is the time of the original waveform data capture. Derived waveforms that are processed (e.g., averaged or filtered) and encoded subsequent to the waveform Acquisition DateTime have a Content Date (0008,0023) and Content Time (0008,0033) representing the time of the processing. In all cases the actual date and time of creation of the SOP Instance for transmission or storage may be recorded in the Instance Creation Date (0008,0012) and Instance Creation Time (0008,0013) (see Section C.12.1).

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