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> ...