extern long GetLayoutEditHandle(LayoutEditHandle handle, void *text, long *styleRunCount, short styleRunLengths[], gxStyle styles[], long *levelRunCount, short levelRunLengths[], short levels[], gxLayoutOptions *layoutOptions, gxPoint *position);
extern void SetLayoutEditHandle(LayoutEditHandle handle, long textRunCount, const short textRunLengths[], const void *text[], long styleRunCount, const short styleRunLengths[], const gxStyle styles[], long levelRunCount, const short levelRunLengths[], const short levels[], const gxLayoutOptions *layoutOptions, const gxPoint *position);
extern void SetLayoutEditHandleParts(LayoutEditHandle handle, gxByteOffset oldStartOffset, gxByteOffset oldEndOffset, long newTextRunCount, const short newTextRunLengths[], const void *newText[], long newStyleRunCount, const short newStyleRunLengths[], const gxStyle newStyles[], long newLevelRunCount, const short newLevelRunLengths[], const short newLevels[]);
extern void SetLayoutEditHandleSelectedParts(LayoutEditHandle handle, long newTextRunCount, const short newTextRunLengths[], const void *newText[], long newStyleRunCount, const short newStyleRunLengths[], const gxStyle newStyles[], long newLevelRunCount, const short newLevelRunLengths[], const short newLevels[]);
extern long GetLayoutEditHandleParts(LayoutEditHandle handle, gxByteOffset startOffset, gxByteOffset endOffset, void *text, long *styleRunCount, short styleRunLengths[], gxStyle styles[], long *levelRunCount, short levelRunLengths[], short levels[]);
extern long GetLayoutEditHandleSelectedParts(LayoutEditHandle handle, void *text, long *styleRunCount, short styleRunLengths[], gxStyle styles[], long *levelRunCount, short levelRunLengths[], short levels[]);