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CML (Chemical Markup Language)

Exchange Schema Chemistry openly published

XML is a mainstream approach providing semantics for science, such as MathML , SBML / BIOPAX (biology), GML and KML (geo) SVG (graphics) and NLM-DTD , ODT and OOXML (documents). CML provides support for most chemistry, especially molecules, compounds, reactions, spectra, crystals and computational chemistry (compchem)....

CML community, from their own opening paragraph

Other chemistry data models

ChEBI Ontology / Vocabulary CDF / InChI / MOL / SMILES chemical identifiers Code System CIF (Crystallographic Information Framework) Information Model
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Model Details
Steward CML community
Layer Exchange Schema
Domain Chemistry
Status live
Access Openly published
Go to the steward →
How I know this

Compiled for the API Evangelist data model catalog, then confirmed against the steward's own site.

Confirmed 2026-08-11

Evidence: name evidence 4/4. Found something wrong? Tell me — corrections are cheap and I would rather be right.

Modernity Profile
59.0 Modernizing
Access Open
Assessed 78.0% of the rubric

A separate measure from the Kin Score, which rates API providers. This rates how current a standard is in how it is expressed, published and paid for — not how good it is. EDIFACT and X12 score low here and move an enormous share of world trade.

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