yams #70499 warn when one use unexpected cardinality for attribute relation [open]

eg using '+*' for subject cardinality usually means the user think we can have a list of values, while this won't work.

Also, we should check 'composite' definition and warn when it doesn't make sense

priorityimportant
typebug
done in1.0.0
load0.200
load left0.200
closed by<not specified>