Hi,

Just my 2 cents:

I can see the benefit of an XML output, but then i would not use underscores 
inside the tags and params.
Also i would prefer using the base operation as tag and not everything 
capsulated inside <Node operation="....">

Something like:

<SelectExpression>
<Filter>
  <NestedLoopOuterJoin>
   <NestedLoopInnerJoin>
    <Filter>
     <Table alias="R">RDB$RELATIONS</Table>
     <FullScan/>
    </Filter>
    <Filter>
     <Table alias="RF">RDB$RELATION_FIELDS</Table>
     <BitMap>
      <Index Scan="Range" Matching="Full">RDB$INDEX_4</Index>
     </BitMap>
     ..........
   </Filter>
   </NestedLoopInnerJoin>
  </NestedLoopOuterJoin>
</Filter>
</SelectExpression>



Kind Regards,
Arno Brinkman
ABVisie
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