Content model for the Structural Index <index-entry> element.
<!ENTITY % index-entry-model "(term, (%struct-link.class;)*, (%index-entry.class; | %see-also-see-entry.class; | %x.class;)* )" >
(term, (ext-link | nav-pointer | nav-pointer-group)*, (index-entry | see-entry | see-also-entry | x)* )
BITS-index0.ent