Hello! <http://www.w3.org/MarkUp/SCHEMA/xhtml-ruby-1.xsd> contains the following definitions:
<!-- rtc (ruby text component) element --> <xs:attributeGroup name="xhtml.rtc.attlist"> <xs:attributeGroup ref="xhtml.ruby.common.attrib"/> </xs:attributeGroup> <xs:group name="xhtml.rtc.content"> <xs:sequence> <xs:element name="rt" type="xhtml.rt.type" maxOccurs="unbounded"/> </xs:sequence> </xs:group> <xs:complexType name="xhtml.rtc.type"> <xs:group ref="xhtml.rt.content"/> <xs:attributeGroup ref="xhtml.rtc.attlist"/> </xs:complexType> This seems to be an error. Instead of <xs:group ref="xhtml.rt.content"/>, it should read <xs:group ref="xhtml.rtc.content"/>. xhtml-ruby-1.xsd is distributed with the .zip and .tgz archives of both <http://www.w3.org/TR/2010/REC-xhtml11-20101123/> and <http://www.w3.org/TR/2010/REC-xhtml-modularization-20100729/>. Regards, Christoph