<xsd:attribute name="header" type="xsd:string" use="required" />
<xsd:attribute name="extension-xname" type="xsd:string" use="optional" />
<xsd:attribute name="extension-name" type="xsd:string" use="optional" />
<xsd:attribute name="header" type="xsd:string" use="required" />
<xsd:attribute name="extension-xname" type="xsd:string" use="optional" />
<xsd:attribute name="extension-name" type="xsd:string" use="optional" />