Non-negative decimal with attribute

[kanpeter]

How can i declare some kind of element like currency which take non-
negative decimal with attribute like
<Buy currency="USD">7.8</Buy>

 

[Martin Honnen]

How can i declare some kind of element like currency which take non-
negative decimal with attribute like
<Buy currency="USD">7.8</Buy>

Define a simple type for the element content, then define the Buy
element and its attribute as shown in
http://www.w3.org/TR/xmlschema-0/#complexTfromSimpleT