XML Tools
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ltxml – sggrep, sgcount, sgrpg
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Perl – XML::Parser::PerlSAX, XML::DOM
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perlSGML – dtd2html, dtddiff, dtdtree
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xmldiff, XML Notepad, XML Spy
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Java
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XP, Xerces [xml4j] (XML Parsers)
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XT, Saxon, LotusXSL, Xalan (XSLT Interpreters)