<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def path_order (x, y):
 """ Helper for as_path, below. Orders properties with the implicit ones first, and within the two sections in alphabetical order of feature name. """

    if x == y:
        return 0

    xg = get_grist (x)
    yg = get_grist (y)

    if yg and not xg:
        return -1

    elif xg and not yg:
        return 1

    else:
        if not xg:
            x = feature.expand_subfeatures([x])
            y = feature.expand_subfeatures([y])

        if x < y:
            return -1
        elif x > y:
            return 1
        else:
            return 0