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===Traditional XML query languages===
[[Query language]]s such as the [[W3C]] standard [[XQuery]]<ref>{{Cite web|url=http://www.w3.org/TR/2007/REC-xquery-20070123/|title=XQuery 1.0: An XML Query Language|last=Boag|first=Scott|author2=Chamberlin, Don |author3=Fernández, Mary F. |author4=Florescu, Daniela |author5=Robie, Jonathan |author6= Siméon, Jérôme |date=23 January 2007|work=W3C Recommendation|publisher=World Wide Web Consortium|accessdate=2009-02-10}}</ref> supply complex queries, but only look for exact matches. Therefore, they need to be extended to allow for vague search with relevance computing. Most XML-centered approaches imply a quite exact knowledge of the documents' [[Database schema|schemas]].<ref name="Schlieder2002">{{Cite journal|url=http://www.cis.uni-muenchen.de/people/Meuss/Pub/JASIS02.ps.gz |title=Querying and Ranking XML Documents |last=Schlieder |first=Torsten |author2=Meuss, Holger |year=2002 |
===Databases===
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== Data-centric XML datasets ==
For data-centric XML datasets, the unique and distinct keyword search method, namely, XDMA<ref>{{Cite journal|last=Selvaganesan|first=S.|last2=Haw|first2=Su-Cheng|last3=Soon|first3=Lay-Ki|title=XDMA: A Dual Indexing and Mutual Summation Based Keyword Search Algorithm for XML Databases
==See also==
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