[loc-en-dev] MessageFormat question

[Masayoshi Okutsu]

I wonder if someone on this mailing list has some idea on my question below.

MessageFormat.format takes a FieldPosition defined as follows:

pos - On input: an alignment field, if desired. On output: the offsets 
of the alignment field.

What's the intention of this spec? What's the alignment field?

Thanks in advance,
Masayoshi