Compatibility with XQuery Specifications
MarkLogic implements the XQuery language, along with the functions and operators specified in the W3C XQuery 1.0 recommendations:
Additionally, there is backwards compatibility with the May 2003 version of the XQuery 1.0 Draft specification used in MarkLogic Server 3.2 and previous versions. For details on the XQuery implementation in MarkLogic Server 4.1, including the three different dialects supported, see the XQuery and XSLT Reference Guide.