The title of the book in the language in which the book was originally published
<!ELEMENT book-title (#PCDATA %title-elements;)* >
(#PCDATA | email | ext-link | multi-link | uri | inline-supplementary-material | related-article | related-object | bold | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | break)*
Any combination of:
<book>
<book-meta>
<book-id pub-id-type="other">emdocrin</book-id>
<book-title-group>
<book-title>Endocrinology</book-title>
<subtitle>An Integrated Approach</subtitle>
</book-title-group>
...</book-meta>
<book-front>...</book-front>
<body>...</body>
<back>...</back>
</book>
bookmeta3.ent