# Semantic Markup Semantic markup labels the role or meaning of content for machines and downstream systems. TEI quotation elements, schema.org vocabulary, RDFa, and microformats can identify quotation-like content. Atomic Markdown goes beyond labeling by allowing an author to transform a contextual sentence into a separately grammatical autonomous surface during composition. Related: [[wiki/Semantic Annotation|Semantic Annotation]], [[wiki/Transformational Extraction|Transformational Extraction]], [[wiki/Structured Authoring and DITA|Structured Authoring and DITA]], [[wiki/Atomic Markdown|Atomic Markdown]].