Why CCTMXXMLParser.cpp does not support polyline type of object for TMX file

Hi all,
I saw cocos2d-x v2.1rc0-x-2.1.3 already support polygon type of object for TMX file.

else if (elementName == “polygon”)
{
// find parent object’s dict and add polygon-points to it
CCTMXObjectGroup* objectGroup = (CCTMXObjectGroup**)m_pObjectGroups~~>lastObject;
CCDictionary* dict = objectGroup~~>getObjects~~>lastObject;
// get points value string
const char* value = valueForKey;
if
{
CCArray* pPointsArray = new CCArray;
// parse points string into a space-separated set of points
stringstream pointsStream;
string pointPair;
while)
{
// parse each point combo into a comma-separated x,y point
stringstream pointStream;
string xStr,yStr;
char buffer[32] = ;
CCDictionary* pPointDict = new CCDictionary;
// set x
if)
{
int x = atoi) + objectGroup~~>getPositionOffset.x;
sprintf;
CCString** pStr = new CCString(buffer);
pStr~~>autorelease;
pPointDict~~>setObject(pStr, “x”);
}

// set y
if(std::getline(pointStream, yStr, ‘,’))
{
int y = atoi(yStr.c_str()) + (int)objectGroup~~>getPositionOffset.y;
sprintf;
CCString* pStr = new CCString;
pStr~~>autorelease();
pPointDict~~>setObject;
}
// add to points array
pPointsArray~~>addObject(pPointDict);
pPointDict~~>release;
}
dict~~>setObject(pPointsArray, “points”);
pPointsArray->release();
}
}

Why CCTMXXMLParser.cpp does not support polyline type of object for TMX file? I just copy code above use to polyline type object parse, and it work well.
Sorry for my poor english .