public function getStreamContentStartOffset()
    {
        if ($this->parent) {
            return $this->streamContentStartPos - $this->parent->streamPartStartPos;
        }
        return $this->streamContentStartPos;
    }
public function getStreamContentStartOffset()
    {
        if ($this->parent) {
            return $this->streamContentStartPos - $this->parent->streamPartStartPos;
        }
        return $this->streamContentStartPos;
    }
public function getStreamContentStartOffset ( ) { if ( $ this -> parent ) { return $ this -> streamContentStartPos - $ this -> parent -> streamPartStartPos ; } return $ this -> streamContentStartPos ; }
Returns the offset for this part's content within its part stream.

@return int
Returns the offset for this part s content within its part stream .