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:
- pubmed_190101.dtd (01/01/19) For use with 2019, 2020 and 2021 PubMed data.
MeSH® DTDs:
- 2021 MeSH Descriptor DTD - used for MeSH Vocabulary, companion database to MEDLINE/PubMed
- 2021 MeSH Qualifier DTD
- 2021 MeSH SCR DTD
- 2021 MeSH Pharmacological Action DTD
- Please note: The 2021 DTD files are to be used with 2021 production MeSH.
For more information, see the Download MeSH Data page.
NLM Catalog DTD:
Current (2021) | Forthcoming (2022) |
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List of Serials Indexed for Online Users (LSIOU)
HMD DTDs:
HSRProj:
Toxicology Databases:
- NLM CCRIS DTD (02/26/04)
- NLM ChemIDplus Subset DTD (04/28/05)
- NLM GENE-TOX DTD (02/11/02)
- NLM HSDB® DTD (04/12/04)
- NLM LactMed DTD (03/27/15)
Last Reviewed: January 22, 2021