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<?xml version="1.0" standalone="yes"?>
<domain name="headings">
<import rel="domain" src="./book_domain.oxm"/>
<struct name="heading" cardinality="1" transparent="true">
<!-- The parent mechanism is a curious thing. Remind yourself
that parent-child-relationship in this sense are mediated
by fields. So we must either reference a field that is
already there or declare a new one on the fly. -->
<parent name="book.book">
<field name="heading" isSubtree="true" optional="true"/>
</parent>
<parent name="book.chapter">
<field name="heading" isSubtree="true" optional="true"/>
</parent>
<parent name="book.section">
<field name="heading" isSubtree="true" optional="true"/>
</parent>
<parent name="book.subsection">
<field name="heading" isSubtree="true" optional="true"/>
</parent>
<parent name="book.paragraph">
<field name="heading" isSubtree="true" optional="true"/>
</parent>
<!-- regarding its fields we have a problem here. We do not want to
declare a new field, because in fact we want to allow every
bit of content that a paragraph would allow - also considering
possible extensions of paragraph by other domains.
So we need to reference the default field of paragraph. -->
<fieldRef name="book.paragraph.$default"/>
</struct>
</domain>
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