Ben, I am finding you are rather quick in conflating concepts.
MarkDown and WikiText are out of the same stable and a far cry from HTML. A wiki link [[...]] differs from an HTML hyperlink as it will create a placemarker for you to go back at any time and fill in the dots. In HTML, you would get a file not found or similar (404 error). MarkDown is human-readable, not binary, so with nothing other than its printout or a simple text editor, you could make sense of it. In comparison, HTML has a lot of scaffolding and requires a browser (viewer) to understand it more clearly. HTML has its own syntax and so a browser is not always an editor. Yes you can use a text editor but it is onerous.
Wikis are content management systems whereas MarkDown is focused on the content and HTML is a high mix of semantics and syntax, usually swamping content. MarkDown is the closest to pure text with a lighter sprinkling of syntax that allows easy conversion to HTML, allowing for all the formatting and styling without the need to learn a language or use a specialist tool.
You mention three file types. I can only guess these are text, raster and vector.
SVG is a file format that handles and edits text and vector and manipulates raster to a limited extent.
Program suites use concepts like object linking and embedding to switch modes into different editor programs. Basically, replacing the tedium of copy & pasting provided you have the right convertors built-in.
APhoto files (proprietary) into Obsidian -> No but a raster version Yes and a link back into the AD Photo program of the master file. So AD and Obsidian have an interchange mechanism.
Obsidian SVG -> APub - Yes; Obsidian PNG -> APub - yes. Both SVG and PNG are open source and AD has convertors for Import and Export.
You want a mix of Text, Raster and Vector all in the same file. Well you could with an SVG but MarkDown handles Text and embeds Vector (SVG) and, better, links in Raster & Vector (SVG).
What confuses me is Obsidian readily capable and can hold all types of digital content (your "blocks") and mash them in countless combinations:
- You can embed a block into another.
- You can collation any number of block into a book, PDF or HTML.
- You can choose you own native editor for Raster (e.g., APhoto or Xara or Adobe CS).
- You can choose your native editor for Vector similarly.
What Affinity does not do is present a cohesive content management or retrieval system and you will be reliant on your tacit knowledge that necessarily has a shelf life.
Obsidian is extensible and handles "New Steps" while Affinity is definitely "Accepted Steps" so you will always be dancing a jig to its tune.
Other Wikis are available and we still use keyboards on computers for a number of reasons.
Thank you for helping me reaffirm my Weltanshauung.
Acorn
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