Crossing: When switching to crossing=unmarked, remove crossing:markings=zebra etc

[tordans]

This is just a stub for now. I just noticed the tagging was not removed. We should check this after the crossing refactoring was merged. Not sure if there is a good way to build this, since not all tags should be removed, just some values.

[k-yle]

@tordans this is possible using removeTags, for example:

id-tagging-schema/data/presets/highway/construction.json

Lines 20 to 24 in 331f51d

	"removeTags": {
	"highway": "construction",
	"access": "no",
	"construction": "*"
	},

[tordans]

@k-yle right, but I was wondering if we really want to remove all tags or just some, when "leaving" the preset. But I guess once the tag is removed the next presets addTags will re-add the right tag, so that will likely be fine.

Personally I will wait for #1201 to be merged to have a clean slate on alls things crossing.

https://github.com/ideditor/schema-builder?tab=readme-ov-file#removetags

[1ec5]

I assume this is actually about overwriting crossing:markings=* with crossing:markings=no? Otherwise, it would immediately trigger a validator warning about incomplete tagging.

Also, for consideration: crossing:markings=surface answers the question, “Are there painted markings?” with, “Well, not really, but there is a surface treatment.” In some jurisdictions, a surface treatment isn’t legally considered a marking, and there’s still debate among specialists about whether they’re more or less visible than standard markings.

The crossing:markings=* proposal included this value with the understanding that some laypeople wouldn’t know that, pedantically, it doesn’t count as an unmarked crossing, so at least it should be recorded somehow. The Unmarked Crossing preset doesn’t include a field for this tag, but I suspect we should preserve it given the lack of real-world clarity.