Meaning of negative vertex coordinate in Wavefront obj file

Question

I have a Wavefront obj file which seems to be parsed mostly fine but there's one detail I'm unclear on.

I have a line like:

'v 0.3062 0.5400 0'

Which works fine

(Note that the third coordinate is always 0, because my object is 2D.)

However, sometimes the X or Y coordinate goes below 0, and I am not sure what this means.

Does that specific coordinate get clipped?

I haven't seen an explanation online (I did read about 'vt'/texture coordinates sometimes going below 0 to indicate tiling). Would be appreciative of any answers.

Thanks in advance.