Recursion in XQuery
Loredana Afanasiev, Torsten Grust, M. Marx, Jan Rittinger, Jens Teubner · 2009
We introduce a controlled form of recursion in XQuery, an inflationary fixed point operator, familiar from the context of relational databases. This operator imposes restrictions on the expressible types of recursion, but it is sufficiently versatile to capture a wide range of interesting use cases, including Regular XPath and its core transitive closure operator.