Merge pull request #1813 from jakesmith/gh-1805

gh-1805 - Child query reading XML dataset failure

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>

thorlcr/graph/thgraph.cpp

@@ -348,6 +348,7 @@ bool isDiskInput(ThorActivityKind kind)
     switch (kind)
     {
         case TAKcsvread:
+        case TAKxmlread:
         case TAKdiskread:
         case TAKdisknormalize:
         case TAKdiskaggregate: