プログレッシブ和英中辞典(第4版)の解説
しょめん【書面】
❶〔書類〕a (written) document
要請を書面にする
put one's request in writing
書面で申し込む
apply in writing
❷〔手紙〕a letter
書面で知らせる
let a person know by letter
❸〔文面〕the contents (of a letter)
書面だけでははっきりしない
It isn't clear 「from the contents alone [simply from what the letter says].
書面審理
〔裁判の〕an examination of the documentary evidence