<!-- NLM Medline DTD              

     
        This is the DTD which NLM has written for External Use. 
        If you are a data Licensee, use the information
        from the MedlineCitation Set.       
 
        Comments and suggestions are welcome.
        November 1, 2002
       
  * = 0 or more occurrences (optional element, repeatable)
  ? = 0 or 1 occurrences (optional element, at most 1)
  + = 1 or more occurrences (required element, repeatable)
  | = choice, one or the other but not both 
  no symbol = required element
    

  NLM exports all attributes as physical data with the November 1, 2002 version of the
  NLM MEDLINE DTD.
  
-->
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<!--   NLM Medline DTD   -->
<!-- Typical usage:   

  <!DOCTYPE MedlineCitationSet PUBLIC "-//NLM//DTD NLM Medline//EN">

-->
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<!--   Revision Notes Section 

  The following changes were made in the nlmmedline_021101.dtd:

       a.  Changed http://www.nlm.nih.gov/databases/dtd/nlmmedlinecitation_011101.dtd" 
           to: nlmmedlinecitation_021101.dtd" 
 
  The following changes were made in the nlmmedline_011101.dtd:

       a.  Made MedlineID optional
 
  The following changes were made in the nlmmedline_010319.dtd:

       a.  The entity reference changed to:
          nlmmedlinecitation_010322.dtd.    
       b.  Added PMID entity 

       c.  The entity reference changed back to 
          nlmmedlinecitation_010319.dtd.
 
       d.  Added GrantID, Agency, Acronym entity references 

       e.  Added MedlineID entity  

 
-->
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<!ENTITY % ArticleTitle.Ref "ArticleTitle">
<!ENTITY % ISSN.Ref "ISSN?">
<!ENTITY % DateCreated.Ref "DateCreated">
<!ENTITY % PubDate.Ref "PubDate">
<!ENTITY % PMID.Ref "PMID">
<!ENTITY % MedlineID.Ref "MedlineID?">
<!ENTITY % GrantID.Ref "GrantID?">
<!ENTITY % Agency.Ref "Agency">
<!ENTITY % Acronym.Ref "Acronym?">
<!-- ================================================================= -->
<!-- Reference to Where the NLM MedlineCitation DTD is located  -->
<!ENTITY % MedlineCitation PUBLIC "-//NLM//DTD MedlineCitation, 1st November 2002//EN"
"nlmmedlinecitation_021101.dtd">
%MedlineCitation;
<!-- ================================================================= -->
<!ELEMENT MedlineCitationSet (MedlineCitation*, DeleteCitation?)>
<!ELEMENT DeleteCitation (MedlineID+ | PMID+)>
<!-- ================================================================= -->
