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:

Current (2012)	Forthcoming (2013)
NLMMedlineCitationSet DTD (01/01/12)	NLMMedlineCitationSet DTD (01/01/13)

NLM Catalog DTD:

Current (2012)	Forthcoming (2013)
NLMCatalogRecordSet DTD (01/01/12)	NLMCatalogRecordSet DTD (01/01/13)

Other Databases:

NLM CCRIS DTD (02/26/04)
NLM ChemIDplus Subset DTD (04/28/05)
NLM DIRLINE® DTD (02/26/04)
NLM GENE-TOX DTD (02/11/02)
NLM HSDB® DTD (04/12/04)
NLM TOXLINE® Subset DTD (03/29/02)

See also the Entrez DTDs.

DTDs for Data Supporting NLM's Leased Databases

2012 NLM Serials DTD: List of Serials Indexed for Online Users (LSIOU)

Current (2012)	Forthcoming (2013)
List of Serials Indexed for Online Users (LSIOU): 2012 NLM Serials DTD (01/01/12)	List of Serials Indexed for Online Users (LSIOU): 2013 NLM Serials DTD (01/01/13)

MeSH® DTDs:

Current (2012)	Forthcoming (2013)
2012 MeSH Descriptor DTD - used for MeSH Vocabulary, companion database to MEDLINE/PubMed 2012 MeSH Qualifier DTD 2012 MeSH SCR DTD	2013 MeSH Descriptor DTD - used for MeSH Vocabulary, companion database to MEDLINE/PubMed 2013 MeSH Qualifier DTD 2013 MeSH SCR DTD

For more information, see the MeSH Download page.