rem: if (qx.util.validator.isValidString(propValue)) { 
add: if (qx.util.Validation.isValidString(propValue)) { 
context: proto._modifyVersion = function(propValue, propOldValue, propData){  if (this._version)  {    this._version.dispose();    this._version = null;  };  if (qx.util.validator.isValidString(propValue)) {    this._version = new qx.types.Version(propValue);  };  return true;};
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