📄 librml.dtd
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<!ELEMENT Library (Book?)+ >
<!ELEMENT Book (Author?, Title, PublicationDate?, Publisher?, Subject?, Review?)* >
<!ELEMENT Author (#PCDATA)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT PublicationDate (#PCDATA)>
<!ATTLIST PublicationDate edition CDATA "" isbn CDATA "">
<!ELEMENT Publisher (#PCDATA)>
<!ELEMENT Subject (#PCDATA)>
<!ELEMENT Review (#PCDATA)>
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