<!-- NLM Serials DTD
                  

       Comments and suggestions are welcome.
       January 1, 2013

    **THIS IS THE CURRENT DTD FOR 2013 CURRENTLY IN USE. **

                                
       This is the DTD which the U.S. National Library of Medicine 
       has written for Internal and External Use. 

       
     
     NOTE:  The use of "Medline" in a DTD or element name does not mean the record 
     represents a citation from a Medline-selected journal.  When the NLM DTDs and 
     XML elements were first created, MEDLINE records were the only data exported.  
     Now NLM exports citations other than MEDLINE records using these tools. To 
     minimize unnecessary disruption to users of the data and tools, NLM has 
     retained the original DTD and element names (e.g., NLMMedline DTD, MedlineTA,
     MedlineJournalInfo).  
    
* = 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

-->
<!-- ================================================================= -->
<!--   Revision Notes Section 


  The following changes were made in the nlmserials_130101.dtd:
  
       a.  Changed nlmserials_120101.dtd to 
           nlmserials_130101.dtd. 
       b.  Added new Serial PMC attribute valid values InProcess and Inactive.
       b.  Added new attribute MedPrint to Serial Element.
       c.  Deleted PMCEmbargo and PMCHoldings Elements.
       
-->
<!-- ============================================================= -->
<!ELEMENT SerialsSet (Serial+)>
<!ELEMENT Serial (NlmUniqueID, Title, MedlineTA?, PublicationInfo?, ISSN*, 
                  ISSNLinking?, ISOAbbreviation?, Language*, AcidFreeYN?,
                  Coden?, TitleContinuationYN?, ContinuationNotes?, 
                  CurrentFormatStatus?, MinorTitleChangeYN?, 
                  IndexingHistoryList?, IndexingSourceList?,
                  CurrentlyIndexedYN?, CurrentlyIndexedForSubset*, 
                  IndexOnlineYN?, IndexingSubset?, ReportedMedlineYN, 
                  BroadJournalHeadingList?, 
                  MeshHeadingList?, CrossReferenceList?, SortSerialName,
                  IlsCreatedTimestamp?, IlsUpdatedTimestamp?, 
                  DeletedTimestamp?)>
<!ATTLIST Serial
	DataCreationMethod (P | K | O) #IMPLIED
        MedPrintYN (Y | N) #IMPLIED
	PMC (Yes | Forthcoming | InProcess | Inactive) #IMPLIED
	Status (NLMCollection | NotNLMCollection) #REQUIRED
>
<!ELEMENT AcidFreeYN (#PCDATA)>
<!ELEMENT BroadJournalHeading (#PCDATA)>
<!ELEMENT BroadJournalHeadingList (BroadJournalHeading+)>
<!ELEMENT Coden (#PCDATA)>
<!ELEMENT ContinuationNotes (#PCDATA)>
<!ELEMENT Country (#PCDATA)>
<!ELEMENT Coverage (#PCDATA)>
<!ELEMENT CoverageNote (#PCDATA)>
<!ELEMENT CrossReference (XrTitle)>
<!ATTLIST CrossReference
	XrType (A | X | S) #REQUIRED
>
<!ELEMENT CrossReferenceList (CrossReference+)>
<!ELEMENT CurrentFormatStatus (#PCDATA)>
<!ELEMENT CurrentlyIndexedForSubset (#PCDATA)>
<!ATTLIST CurrentlyIndexedForSubset
	CurrentSubset (AIM | D | E | H | IM | K | N | Q | QIS | S | T | X) #REQUIRED
	CurrentIndexingTreatment (Full | Selective) #REQUIRED
>
<!ELEMENT CurrentlyIndexedYN (#PCDATA)>
<!ELEMENT DateOfAction (Year, Month, Day, (Hour, (Minute, Second?)?)?)>
<!ELEMENT DatesOfSerialPublication (#PCDATA)>
<!ELEMENT Day (#PCDATA)>
<!ELEMENT DeletedTimestamp (Year, Month, Day, (Hour, (Minute, Second?)?)?)>
<!ELEMENT DescriptorName (#PCDATA)>
<!ATTLIST DescriptorName
	MajorTopicYN (Y | N) "N"
        Type (Geographic) #IMPLIED
>
<!ELEMENT Frequency (#PCDATA)>
<!ATTLIST Frequency
	FrequencyType (Current | Former) "Current"
>
<!ELEMENT Hour (#PCDATA)>
<!ELEMENT ISOAbbreviation (#PCDATA)>
<!ELEMENT ISSN (#PCDATA)>
<!ATTLIST ISSN
	IssnType (Electronic | Print | Undetermined) #REQUIRED
>
<!ELEMENT ISSNLinking (#PCDATA)>
<!ELEMENT IlsCreatedTimestamp (Year, Month, Day, (Hour, (Minute, Second?)?)?)>
<!ELEMENT IlsUpdatedTimestamp (Year, Month, Day, (Hour, (Minute, Second?)?)?)>
<!ELEMENT IndexOnlineYN (#PCDATA)>
<!ELEMENT IndexingHistory (DateOfAction, Coverage?, CoverageNote?)>
<!ATTLIST IndexingHistory
	CitationSubset (AIM | B | C | D | E | F | H | IM | J | K | N | 
                        OM | P | Q | QIS | R | S | T | X) #REQUIRED
	IndexingTreatment (Unknown | Full | Selective | ReferencedIn |
                           ReferencedInNoDetails) #IMPLIED
	IndexingStatus (Ceased-publication | Continued-by-another-indexed-title | 
                        Currently-indexed | Date-range-of-indexed-citations-unspecified | 
	                Deselected) #IMPLIED
>
<!ELEMENT IndexingHistoryList (IndexingHistory+)>
<!ELEMENT IndexingSource (IndexingSourceName, Coverage?)>
<!ELEMENT IndexingSourceList (IndexingSource+)>
<!ELEMENT IndexingSourceName (#PCDATA)>
<!ATTLIST IndexingSourceName
	IndexingTreatment (Unknown | Full | Selective | ReferencedIn |
                           ReferencedInNoDetails) #IMPLIED
	IndexingStatus (Ceased-publication | Continued-by-another-indexed-title | 
                        Currently-indexed | Date-range-of-indexed-citations-unspecified | 
                        Deselected) #IMPLIED
>
<!ELEMENT IndexingSubset (#PCDATA)>
<!ELEMENT Language (#PCDATA)>
<!ELEMENT MedlineTA (#PCDATA)>
<!ELEMENT MeshHeading (DescriptorName, QualifierName*)>
<!ELEMENT MeshHeadingList (MeshHeading+)>
<!ELEMENT MinorTitleChangeYN (#PCDATA)>
<!ELEMENT Minute (#PCDATA)>
<!ELEMENT Month (#PCDATA)>
<!ELEMENT NlmUniqueID (#PCDATA)>
<!ELEMENT Place (#PCDATA)>
<!ELEMENT PublicationEndYear (#PCDATA)>
<!ELEMENT PublicationFirstYear (#PCDATA)>
<!ELEMENT PublicationInfo (Country?, Place*, Publisher*, 
                           PublicationFirstYear?, PublicationEndYear?,
                           Frequency*)>
<!ELEMENT Publisher (#PCDATA)>
<!ELEMENT QualifierName (#PCDATA)>
<!ATTLIST QualifierName
	MajorTopicYN (Y | N) "N"
>
<!ELEMENT ReportedMedlineYN (#PCDATA)>
<!ELEMENT Second (#PCDATA)>
<!ELEMENT SortSerialName (#PCDATA)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT TitleContinuationYN (#PCDATA)>
<!ELEMENT XrTitle (#PCDATA)>
<!ELEMENT Year (#PCDATA)>