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nachtmskFlag for United States of America

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Cold Fusion lang question

Hi,
I have this statement which checks to see if anything exists in the  url field.

<cfif len(associate.url)>
## Field has a value in it
</cfif>

How would I check to see if the field IS NOT populated
This:
<cfif ! len(associate.url)>

or
<cfif not len(assicate.url)>

Neither? Both? Something else?
Thanks!
N
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gdemaria
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