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I am trying to search using NOT and I did the following 

"((collection:Concept) AND ((species:(*)) AND ( - species:(Homo sapiens))))"

This works fine, but this returns all the species which are empty or have blank string.. Is there a better way to do this ? I want to avoid in my search results empty string species or blank species..

Ravi
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1 Answers1

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You can solve this by simply not having a species element in your document if that element would be empty. That is, instead of this:

<doc>
  <species/>
  <other-info>...</other-info>
</doc>

do this:

<doc>
  <other-info>...</other-info>
</doc>
Dave Cassel
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