xml schema validation error “prefix is not bound”

Question

I am entirely new to XML Schema and am trying to get the basics down. Here is my xml schema code (filename: example1.xsd):

Answer 1

When you get an error like this, the simplest way is to add the prefix declaration; in your case, as per schema, just add to your root element the following attribute:

xmlns:sample="http://www.example.com"

Also, this is rather related with XML namespaces.