Proposal: alignment of independently converted document revisions

[jabrailkhalil]

I would like to build a document-revision alignment layer over DoclingDocument. My goal is to match unchanged blocks across two independently converted versions and distinguish moved, added, removed, and edited content.

I would start with two versions of a PDF containing a moved paragraph and one insertion. The result would preserve an identity only for confident matches, retain provenance to both inputs, and surface ambiguous matches for review. I would not automatically transfer an annotation onto a merely similar block.

I see this as separate from Word Track Changes import or a document editor. Would you prefer a companion SDK or a Docling subsystem? I can take the first alignment implementation and evaluation fixtures once the expected matching contract is agreed.

I have taken a similar proposal through upstream discussion and implementation in Qwen Code: the Android direction was accepted, followed by my merged shell/PWA contribution.