simplify exposed APi

src/index.js

@@ -9,28 +9,18 @@ export {
   YXmlHook as XmlHook,
   YXmlElement as XmlElement,
   YXmlFragment as XmlFragment,
-  createRelativePosition,
-  createRelativePositionByOffset,
-  createAbsolutePosition,
-  compareRelativePositions,
-  writeRelativePosition,
-  readRelativePosition,
-  createRelativePositionFromJSON,
-  toAbsolutePosition,
-  AbsolutePosition,
-  RelativePosition,
+  createCursorFromTypeOffset,
+  createCursorFromJSON,
+  createAbsolutePositionFromCursor,
+  writeCursor,
+  readCursor,
   ID,
   createID,
   compareIDs,
-  writeStructsFromTransaction,
-  readStructs,
   getState,
   getStates,
   readStatesAsMap,
   writeStates,
-  readDeleteSet,
-  writeDeleteSet,
-  createDeleteSetFromStructStore,
   writeModel,
   readModel
 } from './internals.js'