True, it was not literally your example, but what a "table of function" 
would be using your example, I worded incorrectly. (and by the way, your 
example would need commas to separate the inner tables :) )

A Lua filter is a table of functions as described in the official page, it 
is not an array (ie a numerical indexed table).

It is true though that a .lua script has to return an *array of filters*, 
as said in the guide:

Pandoc expects each Lua file to return a list of filters
>

So:
- a Lua filter is a table of functions.
- walk_block (and walk_inline) take a Lua filter (table of functions) as 
second argument)
- a script must return an array of filters (i.e. an array of tables of 
functions)
- a script can return many filters, such as:

return {
 { Meta = meta_begin },
 { Pandoc = pandoc_preprocess }.
 { Div = div_preprocess, Para = parasol, Span = doSpan },
 { Inlines = doInlines, Blocks = doBlocks},
 { BulletList = whatever },
}


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