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Poster:	bikefridaywalter	Date:	October 12, 2012 10:13:02am
Forum:	faqs	Subject:	excluding null values from searches

I'm trying to look only for "free" Creative Commons licensed works using the format:

/metadata/licenseurl:(http*by/* OR http*by-sa/* OR http*publicdomain*)

and it works quite well but invariably it will pull up something that appears to have a null value, e.g.:

http://archive.org/details/er014PolluxCovolux-LuxTheorysplit_199

If I search for:
"lux theory" AND /metadata/licenseurl:""
it returns results but if I search for:
"lux theory" AND NOT /metadata/licenseurl:""
it returns the same results. However searching for:
"lux theory" AND /metadata/licenseurl:"*http*"
produces no results.

All of which leads me to believe there's no way to exclude null values. Anyone?