Redundant references in railML 3.x topology

Description

There is a redundancy for modelling the linkage between <netElement> and <netRelation>. The link from the <netRelation> to the <netElement> is mandatory, while the link from the <netElement> to the <netRelation> is optional.

Background

This way of modelling results from RailTopoModel.

Links

• Forum discussion:
  • Raphael Gaudy, 15.09.2021: https://www.railml.org/forum/index.php?t=msg&th=828&goto=2827&#msg_2827
• Git issues:
  • #10 (closed)
  • version3#481 (moved)
• Wiki documentation:
  • CO:relation: https://wiki3.railml.org/wiki/CO:relation

Proposed solution railML 3.2

The optional repeatable child element <relation> in element <netElement> shall be marked DEPRECATED. The link between <netElement> and <netRelation> shall only be modelled using the (mandatory) child elements <elementA> and <elementB> in <netRelation>.