The XML is a new standard for data representation and exchange on
the Internet. There are studies on XML query languages as well as
XML algebras in literature. However, attention has not been paid
to research on XML algebras for data mining due to partially the
fact that there is no widely accepted definition of XML mining tasks. This paper tries to examine the XML mining tasks and provide guidelines to design XML algebras for data mining. Some summarization and comparison have been done to existing XML algebras. We argue that by adding additional operators for mining tasks, XML algebras may work well for data mining with XML documents.