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diff --git a/db/mork/src/morkRowObject.h b/db/mork/src/morkRowObject.h
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+++ b/db/mork/src/morkRowObject.h
@@ -0,0 +1,200 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-  */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _MORKROWOBJECT_
+#define _MORKROWOBJECT_ 1
+
+#ifndef _MORK_
+#include "mork.h"
+#endif
+
+#ifndef _MORKOBJECT_
+#include "morkObject.h"
+#endif
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+class nsIMdbRow;
+#define morkDerived_kRowObject  /*i*/ 0x724F /* ascii 'rO' */
+
+class morkRowObject : public morkObject, public nsIMdbRow  { //
+
+public: // state is public because the entire Mork system is private
+  NS_DECL_ISUPPORTS_INHERITED
+  
+  morkRow*    mRowObject_Row;     // non-refcounted alias to morkRow
+  morkStore*  mRowObject_Store;   // non-refcounted ptr to store containing row
+  
+// { ===== begin morkNode interface =====
+public: // morkNode virtual methods
+  virtual void CloseMorkNode(morkEnv* ev) override; // CloseRowObject() only if open
+
+public: // morkRowObject construction & destruction
+  morkRowObject(morkEnv* ev, const morkUsage& inUsage,
+    nsIMdbHeap* ioHeap, morkRow* ioRow, morkStore* ioStore);
+  void CloseRowObject(morkEnv* ev); // called by CloseMorkNode();
+
+// { ===== begin nsIMdbCollection methods =====
+
+  // { ----- begin attribute methods -----
+  NS_IMETHOD GetSeed(nsIMdbEnv* ev,
+    mdb_seed* outSeed) override;    // member change count
+  NS_IMETHOD GetCount(nsIMdbEnv* ev,
+    mdb_count* outCount) override; // member count
+
+  NS_IMETHOD GetPort(nsIMdbEnv* ev,
+    nsIMdbPort** acqPort) override; // collection container
+  // } ----- end attribute methods -----
+
+  // { ----- begin cursor methods -----
+  NS_IMETHOD GetCursor( // make a cursor starting iter at inMemberPos
+    nsIMdbEnv* ev, // context
+    mdb_pos inMemberPos, // zero-based ordinal pos of member in collection
+    nsIMdbCursor** acqCursor) override; // acquire new cursor instance
+  // } ----- end cursor methods -----
+
+  // { ----- begin ID methods -----
+  NS_IMETHOD GetOid(nsIMdbEnv* ev,
+    mdbOid* outOid) override; // read object identity
+  NS_IMETHOD BecomeContent(nsIMdbEnv* ev,
+    const mdbOid* inOid) override; // exchange content
+  // } ----- end ID methods -----
+
+  // { ----- begin activity dropping methods -----
+  NS_IMETHOD DropActivity( // tell collection usage no longer expected
+    nsIMdbEnv* ev) override;
+  // } ----- end activity dropping methods -----
+
+// } ===== end nsIMdbCollection methods =====
+// { ===== begin nsIMdbRow methods =====
+
+  // { ----- begin cursor methods -----
+  NS_IMETHOD GetRowCellCursor( // make a cursor starting iteration at inRowPos
+    nsIMdbEnv* ev, // context
+    mdb_pos inRowPos, // zero-based ordinal position of row in table
+    nsIMdbRowCellCursor** acqCursor) override; // acquire new cursor instance
+  // } ----- end cursor methods -----
+
+  // { ----- begin column methods -----
+  NS_IMETHOD AddColumn( // make sure a particular column is inside row
+    nsIMdbEnv* ev, // context
+    mdb_column inColumn, // column to add
+    const mdbYarn* inYarn) override; // cell value to install
+
+  NS_IMETHOD CutColumn( // make sure a column is absent from the row
+    nsIMdbEnv* ev, // context
+    mdb_column inColumn) override; // column to ensure absent from row
+
+  NS_IMETHOD CutAllColumns( // remove all columns from the row
+    nsIMdbEnv* ev) override; // context
+  // } ----- end column methods -----
+
+  // { ----- begin cell methods -----
+  NS_IMETHOD NewCell( // get cell for specified column, or add new one
+    nsIMdbEnv* ev, // context
+    mdb_column inColumn, // column to add
+    nsIMdbCell** acqCell) override; // cell column and value
+
+  NS_IMETHOD AddCell( // copy a cell from another row to this row
+    nsIMdbEnv* ev, // context
+    const nsIMdbCell* inCell) override; // cell column and value
+
+  NS_IMETHOD GetCell( // find a cell in this row
+    nsIMdbEnv* ev, // context
+    mdb_column inColumn, // column to find
+    nsIMdbCell** acqCell) override; // cell for specified column, or null
+
+  NS_IMETHOD EmptyAllCells( // make all cells in row empty of content
+    nsIMdbEnv* ev) override; // context
+  // } ----- end cell methods -----
+
+  // { ----- begin row methods -----
+  NS_IMETHOD AddRow( // add all cells in another row to this one
+    nsIMdbEnv* ev, // context
+    nsIMdbRow* ioSourceRow) override; // row to union with
+
+  NS_IMETHOD SetRow( // make exact duplicate of another row
+    nsIMdbEnv* ev, // context
+    nsIMdbRow* ioSourceRow) override; // row to duplicate
+  // } ----- end row methods -----
+
+  // { ----- begin blob methods -----  
+  NS_IMETHOD SetCellYarn(nsIMdbEnv* ev, // synonym for AddColumn()
+    mdb_column inColumn, // column to write
+    const mdbYarn* inYarn) override;   // reads from yarn slots
+  // make this text object contain content from the yarn's buffer
+
+  NS_IMETHOD GetCellYarn(nsIMdbEnv* ev, 
+    mdb_column inColumn, // column to read 
+    mdbYarn* outYarn) override;  // writes some yarn slots 
+  // copy content into the yarn buffer, and update mYarn_Fill and mYarn_Form
+
+  NS_IMETHOD AliasCellYarn(nsIMdbEnv* ev, 
+    mdb_column inColumn, // column to alias
+    mdbYarn* outYarn) override; // writes ALL yarn slots
+
+  NS_IMETHOD NextCellYarn(nsIMdbEnv* ev, // iterative version of GetCellYarn()
+    mdb_column* ioColumn, // next column to read
+    mdbYarn* outYarn) override;  // writes some yarn slots 
+  // copy content into the yarn buffer, and update mYarn_Fill and mYarn_Form
+  //
+  // The ioColumn argument is an inout parameter which initially contains the
+  // last column accessed and returns the next column corresponding to the
+  // content read into the yarn.  Callers should start with a zero column
+  // value to say 'no previous column', which causes the first column to be
+  // read.  Then the value returned in ioColumn is perfect for the next call
+  // to NextCellYarn(), since it will then be the previous column accessed.
+  // Callers need only examine the column token returned to see which cell
+  // in the row is being read into the yarn.  When no more columns remain,
+  // and the iteration has ended, ioColumn will return a zero token again.
+  // So iterating over cells starts and ends with a zero column token.
+
+  NS_IMETHOD SeekCellYarn( // resembles nsIMdbRowCellCursor::SeekCell()
+    nsIMdbEnv* ev, // context
+    mdb_pos inPos, // position of cell in row sequence
+    mdb_column* outColumn, // column for this particular cell
+    mdbYarn* outYarn) override; // writes some yarn slots
+  // copy content into the yarn buffer, and update mYarn_Fill and mYarn_Form
+  // Callers can pass nil for outYarn to indicate no interest in content, so
+  // only the outColumn value is returned.  NOTE to subclasses: you must be
+  // able to ignore outYarn when the pointer is nil; please do not crash.
+
+  // } ----- end blob methods -----
+
+// } ===== end nsIMdbRow methods =====
+
+private: // copying is not allowed
+  morkRowObject(const morkRowObject& other);
+  morkRowObject& operator=(const morkRowObject& other);
+  virtual ~morkRowObject(); // assert that CloseRowObject() executed earlier
+
+public: // dynamic type identification
+  mork_bool IsRowObject() const
+  { return IsNode() && mNode_Derived == morkDerived_kRowObject; }
+// } ===== end morkNode methods =====
+
+public: // typing
+  static void NonRowObjectTypeError(morkEnv* ev);
+  static void NilRowError(morkEnv* ev);
+  static void NilStoreError(morkEnv* ev);
+  static void RowObjectRowNotSelfError(morkEnv* ev);
+
+public: // other row node methods
+
+  nsIMdbRow* AcquireRowHandle(morkEnv* ev); // mObject_Handle
+  
+public: // typesafe refcounting inlines calling inherited morkNode methods
+  static void SlotWeakRowObject(morkRowObject* me,
+    morkEnv* ev, morkRowObject** ioSlot)
+  { morkNode::SlotWeakNode((morkNode*) me, ev, (morkNode**) ioSlot); }
+  
+  static void SlotStrongRowObject(morkRowObject* me,
+    morkEnv* ev, morkRowObject** ioSlot)
+  { morkNode::SlotStrongNode((morkNode*) me, ev, (morkNode**) ioSlot); }
+};
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#endif /* _MORKROWOBJECT_ */