<!ELEMENT list (type,period,publisher,newsletter,issues)>
	<!ELEMENT type (#PCDATA)>
		<!ATTLIST type version CDATA #REQUIRED>
	<!ELEMENT period EMPTY>
		<!ATTLIST period type CDATA #REQUIRED>
		<!ATTLIST period number CDATA #REQUIRED>
		<!ATTLIST period year CDATA #REQUIRED>
	<!ELEMENT publisher (publisher-name,url)>
		<!ATTLIST publisher publisher-id CDATA #REQUIRED>
		<!ELEMENT publisher-name (#PCDATA)>
		<!ELEMENT url (#PCDATA)>
	<!ELEMENT newsletter (newsletter-name,url,url-sign-in)>
		<!ATTLIST newsletter newsletter-id CDATA #REQUIRED>
		<!ATTLIST newsletter newsletter-frequency CDATA #REQUIRED>
		<!ELEMENT newsletter-name (#PCDATA)>
		<!ELEMENT url (#PCDATA)>
		<!ELEMENT url-sign-in (#PCDATA)>
	<!ELEMENT issues (issue+)>
		<!ELEMENT issue (issue-name,url,emails-sent-successfully,emails-bounced)>
			<!ATTLIST issue issue-id CDATA #REQUIRED>
			<!ATTLIST issue issue-publication-date CDATA #REQUIRED>
			<!ELEMENT issue-name (#PCDATA)>
			<!ELEMENT url (#PCDATA)>
			<!ELEMENT emails-sent-successfully (email*)>
				<!ELEMENT email EMPTY>
					<!ATTLIST email address CDATA #REQUIRED>
			<!ELEMENT emails-bounced (email*)>
				<!ELEMENT email EMPTY>
					<!ATTLIST email address CDATA #REQUIRED>