Coordinate References to Topology Points

The layout of coordinate references to topology points is:

<ref_term>::= P<start> [([<step>])] <end>][+|-<dist>]

<start>::=<step>::=<end>::= <integer>

This means that the reference has the same general layout as the FR- and LP-terms, described above.

<start>,<step> and <end> form a sequence of numbers of topology points to which reference is made.

The meaning of the term, that means, u,v,x,y or z coordinate, depends on the keyword.