More than one <nav-pointer> element, in a group associated with a Table of Contents entry (<toc-entry>) or Index Entry (<index-entry>).
<!ELEMENT nav-pointer-group
(#PCDATA %nav-pointer-group-elements;)* >(#PCDATA | nav-pointer)*
...
<book-back>
<index>
<title-group><title>Index</title></title-group>
...
<index-div>
<title-group><title>I</title></title-group>
...
<index-entry>
<term>Interstate commerce</term><x>:</x>
...
<index-entry>
<term>State powers, taxation and regulation</term>
<nav-pointer-group>
<nav-pointer rid="idx1-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx1-2" nav-pointer-type="end-of-range"/>
</nav-pointer-group>
<index-entry>
<term>Balancing test, modern standard</term>
<nav-pointer-group>
<nav-pointer rid="idx2-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx2-2" nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Regulation of commerce</term>
<nav-pointer-group>
<nav-pointer rid="idx6-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx6-2" nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx7-1"
nav-pointer-type="start-of-range"/>–<nav-pointer rid="idx7-2"
nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx8-1"
nav-pointer-type="start-of-range"/>–<nav-pointer rid="idx8-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Taxation of commerce</term>
<nav-pointer-group>
<nav-pointer rid="idx10-1" nav-pointer-type="start-of-range"/>– <nav-pointer
rid="idx10-2" nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx11-1"
nav-pointer-type="start-of-range"/>– <nav-pointer rid="idx11-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
<index-entry>
<term>Apportionment</term>
<nav-pointer-group>
<nav-pointer rid="idx12" nav-pointer-type="point"/>, <nav-pointer rid="idx13-1"
nav-pointer-type="start-of-range"/>– <nav-pointer rid="idx13-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Benefit relationship</term>
<nav-pointer rid="idx14" nav-pointer-type="point"/>
</index-entry>
</index-entry>
</index-entry>
</index-entry>
<index-entry>
<term>Interstate compacts</term><x>.</x>
<see-entry>States, Agreements with other States</see-entry><x>.</x>
</index-entry>
...
</index-div>
...
</index>
</book-back>
...
Including print page numbers:
...
<book-back>
<index>
<title-group><title>Index</title></title-group>
...
<index-div>
<title-group><title>I</title></title-group>
...
<index-entry>
<term>Interstate commerce</term><x>:</x>
...
<index-entry>
<term>State powers, taxation and regulation</term>
<nav-pointer-group>
<nav-pointer rid="idx1-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx1-2" nav-pointer-type="end-of-range"/>
</nav-pointer-group>
<index-entry>
<term>Balancing test, modern standard</term>
<nav-pointer-group>
<nav-pointer rid="idx2-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx2-2" nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Regulation of commerce</term>
<nav-pointer-group>
<nav-pointer rid="idx6-1" nav-pointer-type="start-of-range"/>–<nav-pointer
rid="idx6-2" nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx7-1"
nav-pointer-type="start-of-range"/>–<nav-pointer rid="idx7-2"
nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx8-1"
nav-pointer-type="start-of-range"/>–<nav-pointer rid="idx8-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Taxation of commerce</term>
<nav-pointer-group>
<nav-pointer rid="idx10-1" nav-pointer-type="start-of-range"/>– <nav-pointer
rid="idx10-2" nav-pointer-type="end-of-range"/>, <nav-pointer rid="idx11-1"
nav-pointer-type="start-of-range"/>– <nav-pointer rid="idx11-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
<index-entry>
<term>Apportionment</term>
<nav-pointer-group>
<nav-pointer rid="idx12" nav-pointer-type="point"/>, <nav-pointer rid="idx13-1"
nav-pointer-type="start-of-range"/>– <nav-pointer rid="idx13-2"
nav-pointer-type="end-of-range"/>
</nav-pointer-group>
</index-entry>
<index-entry>
<term>Benefit relationship</term>
<nav-pointer rid="idx14" nav-pointer-type="point"/>
</index-entry>
</index-entry>
</index-entry>
</index-entry>
<index-entry>
<term>Interstate compacts</term><x>.</x>
<see-entry>States, Agreements with other States</see-entry><x>.</x>
</index-entry>
...
</index-div>
...
</index>
</book-back>
...