XML Schema 1.1 Best Practice: Positioning Additional Constraints

Hi Folks,

ISSUE

XML Schema 1.1 allows additional constraints to be imposed on elements and attributes, above and beyond the constraints specified by their data type. Where should those additional constraints be positioned? Does an additional constraint on a descendant belong with the descendant or with an ancestor?

More ... 

http://www.xfront.com/xml-schema-1-1/best-practice/Positioning-Additional-Constraints.pdf

Comments welcome.

/Roger