<!--===================================================-->
<!--ChemIDplus DTD
This is the current DTD which NLM has written for 
external use.

Comments and suggestions are welcome.
2005/04/28

-->
<!--===================================================-->

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated from chemid.xml by XMLBuddy -->
<!ELEMENT CASRegistryNumber (#PCDATA|SourceList)*>
<!ELEMENT Chemical (NameList,NumberList,ClassificationList,FormulaList,FormulaFragmentList,NoteList,LocatorList)>
<!ATTLIST Chemical
	displayFormula CDATA #REQUIRED
	displayName CDATA #REQUIRED
	id NMTOKEN #REQUIRED
>
<!ELEMENT ClassificationCode (#PCDATA|SourceList)*>
<!ELEMENT ClassificationList (ClassificationCode|SuperlistClassCode)*>
<!ELEMENT DescriptorName (#PCDATA)>
<!ELEMENT FileLocator (#PCDATA)>
<!ATTLIST FileLocator url CDATA #IMPLIED>
<!ELEMENT FormulaFragment (#PCDATA|SourceList)*>
<!ELEMENT FormulaFragmentList (FormulaFragment*)>
<!ELEMENT FormulaList (MolecularFormula*)>
<!ELEMENT IdentificationNumber (#PCDATA|SourceList)*>
<!ELEMENT InternetLocator (#PCDATA)>
<!ATTLIST InternetLocator url CDATA #IMPLIED>
<!ELEMENT LocatorList (FileLocator|InternetLocator|SuperlistLocator)*>
<!ELEMENT MixtureName (#PCDATA|SourceList)*>
<!ELEMENT MolecularFormula (#PCDATA|SourceList)*>
<!ELEMENT NameList (DescriptorName|MixtureName|NameOfSubstance|SuperListName|Synonyms|SystematicName)*>
<!ELEMENT NameOfSubstance (#PCDATA|SourceList)*>
<!ELEMENT Note (#PCDATA|SourceList)*>
<!ELEMENT NoteList (Note|SuperlistNote)*>
<!ELEMENT NumberList (CASRegistryNumber|IdentificationNumber|OtherRegistryNumber|RelatedRegistryNumber)*>
<!ELEMENT OtherRegistryNumber (#PCDATA|SourceList)*>
<!ELEMENT RelatedRegistryNumber (#PCDATA|SourceList)*>
<!ELEMENT Source (#PCDATA)>
<!ELEMENT SourceList (Source*)>
<!ELEMENT SuperListName (#PCDATA|SourceList)*>
<!ELEMENT SuperlistClassCode (#PCDATA|SourceList)*>
<!ELEMENT SuperlistLocator (#PCDATA)>
<!ATTLIST SuperlistLocator url CDATA #IMPLIED>
<!ELEMENT SuperlistNote (#PCDATA|SourceList)*>
<!ELEMENT Synonyms (#PCDATA|SourceList)*>
<!ELEMENT SystematicName (#PCDATA|SourceList)*>
<!ELEMENT file (Chemical+)>
<!ATTLIST file
	date CDATA #REQUIRED
	name NMTOKEN #REQUIRED
>