# size in DvMultimedia

**Category:** [Implementers (archive)](https://discourse.openehr.org/c/implementers-archive/158)
**Created:** 2007-06-18 09:19 UTC
**Views:** 4
**Replies:** 3
**URL:** https://discourse.openehr.org/t/size-in-dvmultimedia/14646

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## Post #1 by @system

Why is there a property size for data in DvMultimedia, and not for
integrity\_check?

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## Post #2 by @thomas.beale

Bert Verhees wrote:
> Why is there a property size for data in DvMultimedia, and not for
> integrity\_check?
>  

because the data are likely to be large \(maybe very large\), but the
integrity check will always be small, e\.g\. 1kb or less\.

\- thomas

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## Post #3 by @system

Thomas Beale wrote:
> Bert Verhees wrote:
>  
>> Why is there a property size for data in DvMultimedia, and not for
>> integrity\_check?
>>  
>
> because the data are likely to be large \(maybe very large\), but the
> integrity check will always be small, e\.g\. 1kb or less\.
>  

Thanks, I was too much focussing on programming and I thougt size was to
help programmers, which is a stupid thought, I admit\. Help for
programmers should never be a part of the standard\.

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## Post #4 by @Tim_Cook2

The width attribute is defined as a DV\_DURATION type and it is required\.
However the text says that it should be Void if the Interval\_Event is
instantaneous\. There is also an invariant preventing width from being
Void\.

DV\_DURATION must be a valid ISO8601 duration string\.

I believe that the text explanation should read:

"Length of the interval during which the state was true\. A string
containing a single zero \(e\.g\.'0'\) if an instantaneous event\.

Thoughts?

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**Canonical:** https://discourse.openehr.org/t/size-in-dvmultimedia/14646
**Original content:** https://discourse.openehr.org/t/size-in-dvmultimedia/14646