Several same elements

Hi everybody!

Is it possible to have an xml struktur like below, or do you have any 
better ideas to solve such a structure?

<chapter id=""><!-- chapter name -->
    <chapter id=" "><!-- chapter name --></chapter>
    <chapter id=" "></chapter>
    <chapter id=" ">
        <chapter id=" "></chapter>
    </chapter>
</chapter>

If it would be possible how could i describe this in xml-schema? The way 
I first thought its actually not THE solution. I'm looking for an short 
and simple possibility to solve this problem.

<xsd:element name="chapter" type="chapterone"/>

<xsd:complexType name="chapterone">
    <xsd:sequence>
       <xsd:element name="chapter" type="chaptertwo"/>
	 <xsd:attribute name="id" type="idcheck"/>
    </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="chaptertwo">
    <xsd:sequence>
       <xsd:element name="chapter" type="xsd:string"/>
    </xsd:sequence>
    <xsd:attribute name="id" type="idcheck"/>
</xsd:complexType>

Many thanks in advance.

Cyrill
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