Before revision:  ObjTables includes a format for schemas , a markup language for indicating the class and attribute represented by each spreadsheet and column , and software for using schemas to read, write, validate, compare, merge, split, revision, and analyze spreadsheets .
After revision:  ObjTables includes a format for schemas , a markup language for indicating the class and attribute represented by each spreadsheet and column , and software for using schemas to read, write, validate, compare, merge, revision, and analyze spreadsheets .