How can I know the atom type of the vertex in the surface?

[autodataming]

How can I know the atom type of the vertex in the surface?

  for (int v=0;v<surface.getNumberOfVertices();v++)
  {
    Vector3 atom_position =surface.getVertex(v); //anstrom
            string atom_type=

------------can you offer some api for the goal? like this-----------------
for (int v=0;v<surface.getNumberOfVertices();v++)
{
Vector3 atom_position =surface.getVertex(v).pos(); //anstrom
Vector3 atom_type =surface.getVertex(v).atomtype(); //atomtype