"The way I'd solve this problem would be to develop a new file format that was similar to Markdown but contained semantic elements (eg "this image is relevant t

"The way I'd solve this problem would be to develop a new file format that was similar to Markdown but contained semantic elements (eg "this image is relevant to this bit of text", or "this text explains that text"." It sounds like you're reinventing the Semantic Web: https://en.wikipedia.org/wiki/Semantic_Web https://en.wikipedia.org/wiki/Semantic_Web