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XML
•<bibliography>
–  <book>    <title> Foundations… </title>
–                  <author> Abiteboul </author>
–                  <author> Hull </author>
–                  <author> Vianu </author>
–                  <publisher> Addison Wesley </publisher>
–                  <year> 1995 </year>
–  </book>
–  …
•</bibliography>
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