Is there any way to define a set of schemas with cyclic import graphs to Tamino? (The simplest example would be schema A imports schema B and schema B imports schema A.)

This is not entirely hypothetical - it came up when I was considering storing rddl documents (see http://www.rddl.org ) in Tamino. I would expect it to be common in other cases where XHTML 1.1 modularization (http://www.w3.org/TR/xhtml-modularization ) is used to extend XHTML.

You have to change the schemas and remove the cycle. The schema that references the other less, is to be changed. For example in B you change each reference to A into any/anyAttribute with processContents = “strict” and namespace = “other”.