1*ac2a7c1bSSadaf Ebrahimi# A document may be null. 2*ac2a7c1bSSadaf Ebrahimi--- 3*ac2a7c1bSSadaf Ebrahimi--- 4*ac2a7c1bSSadaf Ebrahimi# This mapping has four keys, 5*ac2a7c1bSSadaf Ebrahimi# one has a value. 6*ac2a7c1bSSadaf Ebrahimiempty: 7*ac2a7c1bSSadaf Ebrahimicanonical: ~ 8*ac2a7c1bSSadaf Ebrahimienglish: null 9*ac2a7c1bSSadaf Ebrahimi~: null key 10*ac2a7c1bSSadaf Ebrahimi--- 11*ac2a7c1bSSadaf Ebrahimi# This sequence has five 12*ac2a7c1bSSadaf Ebrahimi# entries, two have values. 13*ac2a7c1bSSadaf Ebrahimisparse: 14*ac2a7c1bSSadaf Ebrahimi - ~ 15*ac2a7c1bSSadaf Ebrahimi - 2nd entry 16*ac2a7c1bSSadaf Ebrahimi - 17*ac2a7c1bSSadaf Ebrahimi - 4th entry 18*ac2a7c1bSSadaf Ebrahimi - Null 19