v0.2.55..v0.2.56 changeset ChangesetDeriver.h

diff --git a/hoot-core/src/main/cpp/hoot/core/algorithms/changeset/ChangesetDeriver.h b/hoot-core/src/main/cpp/hoot/core/algorithms/changeset/ChangesetDeriver.h
index b0c0fc8..382cdcc 100644
--- a/hoot-core/src/main/cpp/hoot/core/algorithms/changeset/ChangesetDeriver.h
+++ b/hoot-core/src/main/cpp/hoot/core/algorithms/changeset/ChangesetDeriver.h
@@ -22,7 +22,7 @@
  * This will properly maintain the copyright information. DigitalGlobe
  * copyrights will be updated automatically.
  *
- * @copyright Copyright (C) 2015, 2016, 2017, 2018, 2019 DigitalGlobe (http://www.digitalglobe.com/)
+ * @copyright Copyright (C) 2015, 2016, 2017, 2018, 2019, 2020 DigitalGlobe (http://www.digitalglobe.com/)
  */
 #ifndef CHANGESETDERIVER_H
 #define CHANGESETDERIVER_H
@@ -92,10 +92,14 @@ private:
 
   long _numFromElementsParsed;
   long _numToElementsParsed;
+
   // Prevents any reference features from being deleted. This is useful for Differential Conflation
   // and can be used as a safety feature for other conflation workflows.
   bool _allowDeletingReferenceFeatures;
   QMap<Change::ChangeType, int> _changesByType;
+
+  // list of metadata tag keys allowed to trigger a change
+  QStringList _metadataAllowKeys;
 };
 
 typedef std::shared_ptr<ChangesetDeriver> ChangesetDeriverPtr;