Render Markdown

Reads a core-prose datatype value (Markdown / SubstitutableString) off the subject yielded by `renderSource`, by the property `renderProp`. Substitutes every embedded [[reference]] placeholder with a canonical-URL hyperlink and yields a rendered string in the format named by `renderFormat`. For `render-html` the result is HTML (the markdown renderer turns [[references]] into <a> links and renders bold / headings / lists); for `render-markdown` it stays CommonMark with the [[references]] rewritten to `[label](url)`. Link labels come from the [[ref|label]] display text, falling back to the target's rdfs.label, then its local name.