Trouble reading syntaxes

the format writing array types discussed in "12.1 arrays" article:

(i going add link, how verify account?)

array-type:

non-array-type   rank-specifiers

non-array-type:

type

rank-specifiers:

rank-specifier
rank-specifiers   rank-specifier

rank-specifier:

[   dim-separators_opt]

dim-separators:

,
dim-separators   ,

i don't understand @ all! 2 lines in rank-specifiers mean? mean can written "rank-specifier" or "rank-specifier  rank-specifier", or both together? what dim-separators(opt) , what on earth last part mean?

same this:

array-creation-expression:

new   non-array-type   [   expression-list   ]   rank-specifiers_optarray-initializer_opt

new   array-type   array-initializer

what "rank-specifiers_optarray-initializer_{opt" mean?}

let's @ initializers in more detail:

variable-initializer-list:
    variable-initializer
    variable-initializer-list , variable-initializer

ok, recursively defined list, list of "variable-initializer" separated commas.

variable-initializer:
    expression
    array-initializer

and variable initializer can either

• an expression , means lot of stuff, not number (for example expression can be 2 or 42 * x or "abc".length / 3)
• an array-initializer - yes, that's used multidimensional arrays

as non-array-type - means that, type that's not array. doesn't mean "fundamental types" enumerated other struct/class/enum/delegate/interface type.

this non-array-type seems bit fishy though. suspect have been possible define array types bit simpler:

array-type: type rank-specifier

by not restricting ourselves non array types eliminate need list of rank specifiers.

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