<xforms = "http://www.w3.org/2002/xforms">
[xforms:model]
-+ xforms:instance (nt:base) = nt:unstructured *
++ xforms:instance (xforms:instance) = xforms:instance *
+ xforms:bind (xforms:bind) = xforms:bind *
+ xforms:setvalue (xforms:setvalue) = xforms:setvalue *
+[xforms:instance] > nt:unstructured
+
[xforms:bind]
- * (STRING)