How to exclude nodes without tag (learning how to create custom validation)

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Hi all,

I’m exploring and would like to learn how to create custom validation rules.
Currently, I am practicing with creating a validation rule that checks for non matching crossing=* tags between node and way.

Here is my current code. It gets the job done so far. However, it is also flagging nodes that have no tags. How can I exclude nodes that have no tags in this code?

way[crossing =~ /^(unmarked|controlled|)$/] > node{ set .is_crossing_marked }
node[crossing!=unmarked][crossing!=controlled].is_crossing_marked{
throwError: tr("Node does not match crosswalk crossing tag ");
group: tr(“non matching crossing tag”);
}

Any help is greatly appreciated, thanks!

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/how-to-exclude-nodes-without-tag-learning-how-to-create-custom-validation/103246