I've given the XML Schema 1.1 changes a quick review and created the attached document.

More work is required. There are a few features in here which we need to really understand not because they mess us up, but because they have the potential to greatly simplify our lives.

In particular, they have paths in XSD 1.1, and therefore an expression language semantics, a notion of what it means for a path in one place of a schema to refer to a data element defined by another part of the schema. They have an XSD based infoset that is used to explain this. Hopefully we can leverage all this work, and therefore eliminate description of how this stuff works that is specific to DFDL.

There is also conditional type alternatives for elements, and this potentially has impact on selectors - i.e., we may not need them. But it requires a careful look.

...mike