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       hxaddid - add IDs to selected elements


       hxaddid [ -x ] [--] elem|.class|elem.class [ html-file ]


       The  hxaddid  command  copies  an  HTML or XML file to standard output,
       while adding element IDs to the specified elements or classes.

       For example, given the input

           <p>A paragraph without an ID</p>

       the command

           hxaddid p

       will output

           <p id="a-paragraph">A paragraph without an ID</p>

       If you specify a class using .class then IDs  will  only  be  added  to
       elements  that contain that class.  And if you specify an element and a
       class using elem.class then IDs will only be  added  to  the  specified
       elements that contain the specified class.

       If two elements would naturally generate the same ID, a number is added
       to the ID name (starting with 0) to make sure the IDs are unique.   IDs
       are not added to matching elements that already contain an ID.


       The following options are supported:

       -x        Use  XML conventions: empty elements are written with a slash
                 at the end: <IMG />. Also causes the element  to  be  matched


       The following operands are supported:

       elem      The name of element to select.

       .class    The name of class to select.

                 The name of element that contains class to select.

       html-file The name of an HTML file.


       The following exit values are returned:

       0         Successful completion.

       > 0       An  error  occurred  in the parsing of one of the HTML or XML


       asc2xml(1), hxprune(1), hxnormalize(1), hxnum(1), hxtoc(1), hxunent(1),
       xml2asc(1), UTF-8 (RFC 2279)


       Assumes UTF-8 as input. Doesn’t expand character entities. Instead pipe
       the input through hxunent(1) and asc2xml(1) to convert it to UTF-8.