data_block      # this is a valid data_ block name
data_block2     # this is a valid second data_ block (first one was empty)

data_block3 _tag_data_block3      # with a comment
            anddata_block3_inside # as unquoted string

data_block4
save_blockstart
_what   is_this?
save_ #end

data_ # do not try this at home! Missing data_ block name
