The OP might also want to look at the type reference for Lua filters which
if I am not mistaken corresponds closely to the Haskell types. (I don't
know Haskell but at least the names/tags correspond closely.)

https://pandoc.org/lua-filters.html#lua-type-reference

Den fre 17 sep. 2021 21:26'Daniel Gnoutcheff' via pandoc-discuss <
pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> skrev:

> On 9/17/21 12:18 AM, Harsh Donga wrote:
> > Sorry to bother you,
> >
> > I could read in the documentation that Attr stores (identifier, classes,
> > key-value pairs)
> > What do these actually mean? can you share an example?
>
> The AST corresponds closely to Pandoc's Markdown dialect, so a good way
> to learn about an AST type is to study the User's Manual sections that
> document the corresponding Markdown features.  You may have noticed that
> the Attr type is used by the Header, CodeBlock, Div, Code, Link, Image,
> and Span data constructors.  In Pandoc's Markdown, headings, code
> blocks, div blocks, code inlines, links, images, and spans all can have
> "attributes".  The relevant manual sections discuss their syntax and how
> they are used (or ignored) by writers:
>
> - <https://pandoc.org/MANUAL.html#extension-header_attributes>
> - <https://pandoc.org/MANUAL.html#extension-fenced_code_attributes>
> - <https://pandoc.org/MANUAL.html#extension-fenced_divs>
> - <https://pandoc.org/MANUAL.html#extension-inline_code_attributes>
> - <https://pandoc.org/MANUAL.html#extension-link_attributes>
> - <https://pandoc.org/MANUAL.html#extension-bracketed_spans>
>
> I would just add that Pandoc's HTML writer converts Attr values into
> HTML tag attributes, including those classes and key-value pairs that
> Pandoc does not itself recognize.  Attributes and classes that mean
> nothing to Pandoc can become meaningful if, for example, you provide a
> custom template with CSS or JavaScript that does something with them.
>
> HTH!
>
> Later,
> Daniel G.
>
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