+544.+ The bracket [] indicates that the word or words included in the
bracket are not in the original discourse.
+545.+ The bracket is generally used by editors in supplying missing
words, dates and the like, and for corrections, additions and
explanations. For example:
This rule usually applies though there are some exceptions. [See Note
3, Rule 1, Page 67].
+546.+ All interpretations, notes, corrections and explanations, which
introduce words or phrases not used by the author himself, should be
enclosed in brackets.
+547.+ Brackets are also used for a parenthesis within a parenthesis. If
we wish to introduce a parenthetical statement within a parenthetical
statement this should be enclosed in a bracket. For example:
He admits that this fact (the same fact which the previous witness
[Mr. James E. Smith] had denied) was only partially true.