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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}}</ref>
==Existing XML search engines==
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