@electronic{www.ibm.com,
   title       = {The Java XPath API}, 
   url         = {http://www.ibm.com/developerworks/library/x-javaxpathapi/index.html},
   biburl      = {https://puma.uni-kassel.de/url/0710195eee97eb75e187803bf02e5011/stephandoerfel},
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@electronic{www.w3schools.com,
   title       = {XPath Tutorial}, 
   url         = {http://www.w3schools.com/xpath/default.asp},
   biburl      = {https://puma.uni-kassel.de/url/9aae953993fa3720dccc5ffd7191c2a3/stephandoerfel},
   keywords    = {tutorial xml xpath xslt},
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@electronic{www.webreference.com,
   title       = {Jakarta Commons Online Bookshelf: XML parsing with Digester. Part 1 - WebReference.com-}, 
   url         = {http://www.webreference.com/programming/jakarta/},
   biburl      = {https://puma.uni-kassel.de/url/638cd8d53977191c3f4dbe2a5135df9a/stephandoerfel},
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@electronic{www.xml.com,
   title       = {XML.com: Perl XML Quickstart: The Standard XML Interfaces}, 
   url         = {http://www.xml.com/pub/a/2001/05/16/perlxml.html},
   biburl      = {https://puma.uni-kassel.de/url/b76352fe86dd470eb62144fcb623b67a/stephandoerfel},
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@electronic{basex.org,
   title       = {BaseX | The XML Database}, 
   url         = {http://basex.org/},
   biburl      = {https://puma.uni-kassel.de/url/1794fc5592bc4293724fff8a155ac7d5/benz},
   keywords    = {basex database free open_source xml},
   added-at    = {2011-03-24T23:23:07.000+0100},
   description = {BaseX is a light-weight, high-performance and scalable XML database system and XPath/XQuery processor, including full support for the W3C Update and Full Text extensions. An interactive and user-friendly GUI frontend gives you great insight into large XML data instances. },
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