Raw files‘ structure did not contain "book" ，why?

[lhl260]

[ { "abbrev" : "abbrev" "book" : "name"// not contained in raw files "chapters": [ ["Verse 1", "Verse 2", "Verse 3", "..."], ["Verse 1", "Verse 2", "Verse 3", "..."], ["Verse 1", "Verse 2", "Verse 3", "..."] ] } ]