Propose Semantic Constraint introduced by ETCS group
The ETCS working group introduced a semantic constraint for balise groups documented in the provided documentation for the element baliseGroup and balise. The following wording was proposed:
The element “baliseGroup” shall always use the railML option “spotLocation” to define the balise group location on the topology.
Also a justification for the semantic constraint was brought forth:
According to UNISIG-026 (versions 2.3.0, 3.4.0 or 3.6.0), section 3.4.2.2.1 and UNISIG-040 (versions 2.3.0, 3.3.0 or 3.4.0) section 3.3.1.3, a balise group (represented by the railML element “baliseGroup”) shall be considered as point-shaped element without extension. The reference location of the balise group is the location of the balise with N_PIG=0.
A forum post should be created and if nobody disagrees the semantic constraint should be added to the wiki.