How to parse DXF hatch by means of dxflib

Question

I am using dxflib in order to parse DXF files. I have implemented the class DL_CreationAdapter

class EntityHandler : public DL_CreationAdapter
{
public:

    /** Called for every hatch entity. */
    void addHatch(const DL_HatchData& data);

    /** Called for every hatch loop. */
    void addHatchLoop(const DL_HatchLoopData& data);

    /** Called for every hatch edge entity. */
    void addHatchEdge(const DL_HatchEdgeData& data);

};

But I have a problem while parsing entities of type hatch. That is, I am not able to find the data related to rounded paths.

Considering for example the following DXF image:

For each DL_HatchEdgeData I receive DL_HatchEdgeData.type equals to 0 and a list of vertices, so that I am able to build a path like the following one:

Please note the difference between the two images.

Where can I find some information about the fact that some conjunctions of my path are rounded?