Every document parser must first answer this question:

Why not pandoc import filter.

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The above does not mean: "do not parser outside pandoc". There are reasons not to use pandoc. It means: Please explain why not. It helps others to choose.

Maybe this is not the answer for Asciidocr, but quite often the answer is "pandoc has an internal representation of what a document is. That representation is not as rich as many of the formats it supports."