LMD: Linked Markdown — Markdown as Semantic Infrastructure Ethan Davidson · 2026
LMD (Linked Markdown) is a specification for structuring, validating, and querying typed Markdown documents as first-class semantic graph nodes. An LMD document is simultaneously valid CommonMark and valid JSON-LD — rendering in any standard Markdown renderer while participating in an RDF graph with SHACL validation, OWL-RL inference, and SPARQL query capability. No custom syntax is introduced; the protocol lives entirely in frontmatter and linking conventions.