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Document Type Definitions (DTDs) for NLM Databases

The purpose of a DTD (Document Type Definition) is to define the building blocks of an XML document. It defines the document structure with a list of allowable elements. Below are the DTDs that define NLM XML data.

MEDLINE®/PubMed® DTD:

See also the Entrez DTDs.

MeSH® DTDs:

For more information, see the MeSH Download page.

NLM Catalog DTD:
List of Serials Indexed for Online Users (LSIOU)
HMD DTDs:
HSRProj:

Toxicology Databases: