I'd like to extend the lua wordcount filter to tell me a bit more about 
specific parts of my text, specifically how many words are in the footnotes 
and how many words are in "original quotations," which I mark off with the 
<qu></qu> tag in my markdown (and which I then strip later via another 
filter for certain versions). I got the footnote part to work but can't 
figure out the RawInline html bit. Any guidance would be appreciated.

Here's my filter followed by a simple markdown doc and the results

```
-- counts words in a document 

words = 0 
notewords = 0
quotewords = 0
notenoquotewords = 0
noquotewords = 0

wordcount = { 
  
    Note = function(el)
        pandoc.walk_inline(el, {
            Str = function(el) 
                if el.text:match("%P") then 
                    notewords = notewords + 1
                end 
            end })
    end,

    RawInline = function(el)
        if el.text == '<qu>' then
            pandoc.walk_inline(el, {
                Str = function(el)
                    if el.text:match("%P") then 
                        quotewords = quotewords + 1
                    end 
            end })
        end
    end,

    Str = function(el) 
        -- we don't count a word if it's entirely punctuation: 
        if el.text:match("%P") then 
            words = words + 1 
        end 
    end, 

    Code = function(el) 
        _,n = el.text:gsub("%S+","") 
        words = words + n 
    end, 

    CodeBlock = function(el) 
        _,n = el.text:gsub("%S+","") 
        words = words + n 
    end 
} 

function Pandoc(el) 
    -- skip metadata, just count body: 
    pandoc.walk_block(pandoc.Div(el.blocks), wordcount) 
    mainwords = words - notewords
    notenoquotewords = notewords - quotewords
    noquotewords = words - quotewords
    print(words .. " total words")
    print(mainwords .. " words in main text") 
    print(notewords .. " words in notes")
    print(noquotewords .. " total words minus original quotes")
    print(quotewords .. " words in original quotes")
    print (notenoquotewords .. " words in notes minus original quotes")
    os.exit(0) 
end
```

test.md mwe markdown file
```
Suspendisse malesuada venenatis mauris. Curabitur ornare mollis velit. Sed 
vitae metus.
"Morbi posuere mi id odio."[^1]

[^1]: Citation. <qu>("Original quotation here.")</qu>
```
`pandoc --lua-filter wordcount.lua test.md`

> 20 total words
> 16 words in main text
> 4 words in notes
> 20 total words minus original quotes
> 0 words in original quotes
> 4 words in notes minus original quotes

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