How to distinguish 1D network coordinates defined by (x,y)-values or branch id and offset on that branch

[mooiman]

How to distinguish 1D network coordinates defined by (x,y)-values or branch id and offset on that branch

Example:
mesh1d:node_coordinates = "mesh1d_node_x mesh1d_node_y" ;
and
mesh1D:node_coordinates = "mesh1D_node_branch mesh1D_node_offset" ;
and
mesh1d:node_coordinates = "mesh1d_node_branch mesh1d_node_offset mesh1d_node_x mesh1d_node_y" ;