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Vanilla tags
Tags are part of Vanilla Minecraft itself. For example, vanilla block tags are used for various block properties, vanilla item tags are used for various item properties, vanilla advancement files and vanilla recipe files, and vanilla entity type tags are used for various mob properties.
We decided to use these tags in our new flag system, this way you can easily set scopes of flags without having to add like 10 values yourself.
Tags are used in flags that accept block types, but are prefixed with
#. As an example, the command /plot flag set use #signs will add the sign category to the use flag. This is equivalent to adding every sign type to the flag.