Problem with index building

Can someone tell me what is the matter with this index entry in
textsearch.sgml?

     <indexterm zone="textsearch-indexes">
     <primary>GiST</primary>
     </indexterm>

I have commented out the entry in CVS so indexes can be built but with
it enabled it generates an error in bookindex.sgml:

    openjade:bookindex.sgml:2731:0:E: character data is not allowed here
    openjade:bookindex.sgml:2732:66:E: document type does not allow element
    "ULINK" here; missing one of "SEEIE", "SEEALSOIE", "SECONDARYIE" start-tag
    openjade:bookindex.sgml:2744:0:E: character data is not allowed here
    openjade:bookindex.sgml:2745:66:E: document type does not allow element
    "ULINK" here; missing one of "SEEIE", "SEEALSOIE", "SECONDARYIE" start-tag

--
  Bruce Momjian  <bruce@momjian.us>          http://momjian.us
  EnterpriseDB                               http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +