Miscellaneous options
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   *** describe sgml-save-options

 - User Option: sgml-ignore-undefined-elements
     Start-tags for undefined elements will either be ignored, if
     `sgml-ignore-undefined-elements' is `t', or assumed to be
     acceptable in the current element and defined with `O O ANY'

 - User Option: sgml-range-indicator-max-length
     Maximum number of characters used from the first and last entry of
     a sub-menu to indicate the range of that menu.

     This is used for long menus of elements, tags or entities that are
     split into `sgml-max-menu-size' big sub-menus.