anchor.diff:    <node path="Orthologue.orthologue.organism" type="Organism">
     </node>
     <node path="Orthologue.orthologue.organism.name" type="String">
  -    <constraint op="=" value="Homo sapiens" description="" identifier="" code="C">
  +    <constraint op="=" value="Homo sapiens" description="" identifier="" code="B">
       </constraint>
     </node>
   </query>
  
positive.code: 
            <li>
            <im:querylink text="Orthologues: <i>D. melanogaster</i> vs <i>D. pseudoobscura</i> " skipBuilder="true">
             <query name="" model="genomic" view="Orthologue.gene.identifier Orthologue.gene.organismDbId Orthologue.gene.symbol Orthologue.orthologue.identifier Orthologue.orthologue.organismDbId Orthologue.orthologue.symbol" constraintLogic="C and A">
    <node path="Orthologue" type="Orthologue">
    </node>
    <node path="Orthologue.gene" type="Gene">
  
negative.code: 
            <li>            
              <im:querylink text="Orthologues: <i>D. melanogaster</i> vs <i>C. elegans</i> " skipBuilder="true">
                <query name="" model="genomic" view="Orthologue.gene.identifier Orthologue.gene.organismDbId Orthologue.gene.symbol Orthologue.orthologue.identifier Orthologue.orthologue.organismDbId Orthologue.orthologue.symbol">
    <node path="Orthologue" type="Orthologue">
    </node>
    <node path="Orthologue.gene" type="Gene">
  