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The merged map contains a <oxy:front-page> element, child of the root element. This contains the metadata and an <oxy:front-page-title> element with the title structure.

 <bookmap xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/" ...>
     <oxy:front-page xmlns:oxy="http://www.oxygenxml.com/extensions/author">
        <bookmeta xmlns:dita-ot="http://dita-ot.sourceforge.net/ns/201007/dita-ot"
            ...
        </bookmeta>
        <oxy:front-page-title>
            <booktitle xmlns:dita-ot="http://dita-ot.sourceforge.net/ns/201007/dita-ot"
                class="- topic/title bookmap/booktitle ">
                <booklibrary class="- topic/ph bookmap/booklibrary ">Retro Tools</booklibrary>
                <mainbooktitle class="- topic/ph bookmap/mainbooktitle ">Product tasks</mainbooktitle>
                <booktitlealt class="- topic/ph bookmap/booktitlealt ">Tasks and what they can do</booktitlealt>
            </booktitle>
        </oxy:front-page-title>
     </oxy:front-page>