The element “x” in namespace “xSchema” has invalid child element “y” in namespace “xSchema”. List of possible elements expected: “y”

Question

I am writing a schema for my XML validation final, and finally got everything (just about) working. But now I\'m getting the strangest error in my XML. I\'ll start by showing my

Answer 1

The element 'orders' in namespace 'OrdersSchema' 
has invalid child element 'order' in namespace 'OrdersSchema'. 
List of possible elements expected: 'order'. 

In other words, it thinks your schema told the parser to expect a non-namespaced <order> child element, and you provided a namespaced <os:order> in the instance document.

http://www.w3.org/TR/xmlschema-0/#NS

Answer 2

Your use of

elementFormDefault="unqualified"
attributeFormDefault="qualified"

is highly unusual, and is probably the source of the trouble. Unless you really want to do something unusual, these should be the other way around.