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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's XML data.

DTDs for NLM's Leased Databases

MEDLINE®/PubMed® DTD:

NLM Catalog DTD:

Other Databases:

See also the Entrez DTDs.

DTDs for Data Supporting NLM's Leased Databases

List of Serials Indexed for Online Users (LSIOU)
MeSH® DTDs:

For more information, see the MeSH Download page.

DTDs for Historical Data

HMD DTDs: