Your explanations make things very clear.
It was my misuse of SimleVocabulary/SimpleTerm.
I misunderstood the responsibility of token. I didn't notice
that DroopdownWidget renders token only when no title is given.
When reading the docstrings of ITerm/ITokenizedTerm/ITitledTokenizedTerm,
I couldn't realize such things that you explained. It would
be nice that there were a document like your explanation.
Thanks a lot.
# I beg you to point out the error or rudeness of my english.
# Thank you.
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