<xs:element name="ruby">
<xs:complexType>
<xs:choice>
<xs:sequence>
<xs:element ref="xhtml:rb" />
<xs:choice>
<xs:element ref="xhtml:rt" />
<xs:sequence>
<xs:element ref="xhtml:rp" />
<xs:element ref="xhtml:rt" />
<xs:element ref="xhtml:rp" />
</xs:sequence>
</xs:choice>
</xs:sequence>
<xs:sequence>
<xs:element ref="xhtml:rbc" />
<xs:element ref="xhtml:rtc" />
<xs:element ref="xhtml:rtc" minOccurs="0" />
</xs:sequence>
</xs:choice>
</xs:complexType>
</xs:element>
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