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  opentag = tagname attribute* spacechar* [/]? [>];
  closetag = [/] tagname spacechar* [>];

  htmlcomment = "!---->" | ("!--" ([-]? [^\x00>-]) ([-]? [^\x00-])* "-->");

  processinginstruction = "?" ([^?>\x00]+ | [?][^>\x00] | [>])* "?>";

  declaration = "!" [A-Z]+ spacechar+ [^>\x00]* ">";

  cdata = "![CDATA[" ([^\]\x00]+ | "]" [^\]\x00] | "]]" [^>\x00])* "]]>";

  htmltag = opentag | closetag | htmlcomment | processinginstruction |
            declaration | cdata;

  in_parens_nosp   = [(] (reg_char|escaped_char|[\\])* [)];

  in_double_quotes = ["] (escaped_char|[^"\x00])* ["];
  in_single_quotes = ['] (escaped_char|[^'\x00])* ['];
  in_parens        = [(] (escaped_char|[^)\x00])* [)];

  scheme = 'coap'|'doi'|'javascript'|'aaa'|'aaas'|'about'|'acap'|'cap'|'cid'|'crid'|'data'|'dav'|'dict'|'dns'|'file'|'ftp'|'geo'|'go'|'gopher'|'h323'|'http'|'https'|'iax'|'icap'|'im'|'imap'|'info'|'ipp'|'iris'|'iris.beep'|'iris.xpc'|'iris.xpcs'|'iris...
*/