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==Ranking==
Ranking in XML-Retrieval can incorporate both content relevance and structural similarity, which is the resemblance between the structure given in the query and the structure of the document. Also, the retrieval units resulting from an XML query may not always be entire documents, but can be any deeply nested XML elements, i.e. dynamic documents. The aim is to find the smallest retrieval unit that is highly relevant. Relevance can be defined according to the notion of specificity, which is the extent to which a retrieval unit focuses on the topic of request.<ref name="INEX2006">{{Cite web|url=http://www.cs.otago.ac.nz/homepages/andrew/2006-10.pdf |title=Overview of INEX 2006 |last=Malik |first=Saadia |author2=Trotman, Andrew |author3=Lalmas, Mounia |author4=Fuhr, Norbert |year=2007 |work=Proceedings of the Fifth Workshop of the INitiative for the Evaluation of XML Retrieval |accessdate=2009-02-10 |deadurl=yes |archiveurl=
==Existing XML search engines==
An overview of two potential approaches is available.<ref>{{Cite web|url=http://www.sigmod.org/record/issues/0612/p16-article-yahia.pdf|title=XML Search: Languages, INEX and Scoring|last=Amer-Yahia|first=Sihem|author2=Lalmas, Mounia |year=2006|publisher=SIGMOD Rec. Vol. 35, No. 4|accessdate=2009-02-10}} {{Dead link|date=October 2010|bot=H3llBot}}</ref><ref>{{Cite paper|id = {{citeseerx|10.1.1.109.5986}}|title=XML Retrieval: A Survey|last=Pal|first=Sukomal|date=June 30, 2006|publisher=Technical Report, CVPR }}</ref> The INitiative for the Evaluation of XML-Retrieval (''INEX'') was founded in 2002 and provides a platform for evaluating such [[algorithm]]s.<ref name="INEX2006" /> Three different areas influence XML-Retrieval:<ref name="INEX2002">{{Cite web|url=http://www.is.informatik.uni-duisburg.de/bib/pdf/ir/Fuhr_etal:02a.pdf |title=INEX: Initiative for the Evaluation of XML Retrieval |last=Fuhr |first=Norbert |author2=Gövert, N. |author3=Kazai, Gabriella |author4=Lalmas, Mounia |year=2003 |work=Proceedings of the First INEX Workshop, Dagstuhl, Germany, 2002 |publisher=ERCIM Workshop Proceedings, France |accessdate=2009-02-10 |deadurl=yes |archiveurl=
===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 |work=Journal of the American Society for Information Science and Technology, Vol. 53, No. 6 |accessdate=2009-02-10 |deadurl=yes |archiveurl=https://web.archive.org/web/20070610002349/http://www.cis.uni-muenchen.de/people/Meuss/Pub/JASIS02.ps.gz |archivedate=June 10, 2007 }}</ref>
===Databases===
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