"Export considered harmful"
Because software rarely operate on "files in folders" anymore, "export" is increasingly the way software exposes data. But usually you don't want a dead snapshot; you want to "use this data elsewhere"—which requires repeatedly exporting & reconciling.
Conversation
Say I make an app for annotating papers. An old-fashioned way to do this would be to make a desktop app which views PDF files and writes annotations into the file. Now Spotlight can see them; Zotero can display them; etc. But SaaS must "import" the PDF and "export" annotations.
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But "export annotations" is not the same as "save annotations" because now if I add more annotations to the PDF, I must export them again, and then reconcile that new export with whatever downstream tools used the old data. This gets much worse in the bi-directional case!
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Consider also Zotero: it's native software, but it's designed to manage your papers' files internally. You can export individual PDFs elsewhere, but changes made to that PDF won't be reflected within the app. Contrast this with "Zotero is a viewer for a (nested) folder of PDFs".
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The "old-school" way to do this is to design well-structured file formats which multiple pieces of software can operate on. TimBL proposes bringing this to the SaaS world via SOLID and modern flexible schema formats. Web3 folks have related proposals.
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Another angle: I'm intrigued by the possibility of a "lens file": what if my PDF annotator can "save a Markdown lens" which contains my annotations. The difference from an export, though, is that the lens would be "live", with a bidi scheme for handling changes.
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That is, if I add new annotations in my PDF annotator, they're added to the .md (without disturbing other content in the file); if an annotation is altered in the .md, that's reflected in the viewer app.
(Doing this well requires careful format design! Maybe Cambria could help?)
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Recently, I stumbled upon this (still-in-development) app which looks like it might solve this very issue!
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oh... :(