AIXM-322 Obstacle visual marking new property

Description

Add a new attribute (“marked”) to VerticalStructure feature to indicate if the structure is marked or not.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-289 

For consistency in the AIXM model, marking and lighting for obstacles should be treated in the same way. For lighting, the VerticalStructure feature includes two attributes that describe its lighting:

• VerticalStructure.lighted – A simple indication that the obstacle is lighted, when no further details are available.
• VerticalStructure.lightingICAOStandard – An indication that the lighting of a vertical structure used as criteria for the ICAO standard as described in Annex 14.

In AIXM v5.1, the VerticalStructure feature includes one attribute that describes its marking, VerticalStructure.markingICAOStandard, which is similar to the lightingICAOStandard attribute. However, there is no attribute to provide a simple indication that the obstacle is marked when no additional details are available. The new attribute VerticalStructure.marked for marking would be analogous to the VerticalStructure.lighted attribute for lighting.

Impact assessment

There is no impact on existing implementations as the current AIXM 5.1(.1) data remains fully valid against AIXM 5.2. No attributes are removed from the VerticalStructure feature in AIXM 5.2.

When receiving data from AIXM 5.2 implementations, current AIXM 5.1(.1) systems that are interested in the new data will have be able to map back the attribute VerticalStructure.marked to the attribute VerticalStructure.markingICAOStandard, using the workaround approach as described in the mapping rules further in this document.

Mapping example

(Note: for mapping test data see: https://github.com/aixm/mapping_52_511/tree/master/AIXM-322) 

AIXM 5.2	AIXM 5.1(.1)