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I'm writing a CAML query for SharePoint. The list contains a term set field. I want to get all list items having specific terms, plus items where no term is set. My query contains this:

<Or>
    <In>
        <FieldRef Name='MyTaxonomyField' /> 
        <Values> 
            <Value Type='Integer'>1</Value> 
            <Value Type='Integer'>2</Value> 
        </Values>
    </In>
    <IsNull>
        <FieldRef Name='MyTaxonomyField'/>
    </IsNull>
</Or>

The <In> clause gets all items with specific terms. <IsNull> gets all items without any terms. Individually both of these work. Put together like this they do not: Only the items with defined terms are returned (i.e. the <In> clause runs)

The order does not matter. Changing <IsNull> to something else gives similar results. <In> appears to override everything else (runs first?). Is this a knowns problem? Is there any solution except for exchanging <In> for a bunch of <Or> clauses?

3
  • 2
    I recognize this behavior. Sadly the only workaround I have is replacing with nested OR-s Commented Oct 4, 2015 at 8:32
  • Is it perhaps possible to use <In> to select null values too?
    – rlv-dan
    Commented Oct 5, 2015 at 5:41
  • Not quite sure how one could do that? Commented Oct 5, 2015 at 5:58

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