what's wrong with my XML schema?

Question

This is the schema in my.xsd :

<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' 
  xmlns:p='some-namespace' targetNamespace='some-namespace'>
  <xs:element name='root' type='p:main'/>
  <xs:complexType name='main'>
    <xs:sequence>
      <xs:element name='alpha' type='xs:string' />
    </xs:sequence>
  </xs:complexType>
</xs:schema>

This is the XML document I'm validating against it:

<root xmlns='some-namespace' 
  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
  xsi:schemaLocation='some-namespace my.xsd'>
  <alpha>xxx</alpha>
</root>

SAX parser says:

"Invalid content was found starting with element 'alpha'. One of 
'{alpha}' is expected."

What's wrong?

Answer 1

You have to add

elementFormDefault="qualified"

in your schema definition. It would also be a good idea not to use relative namespace, ie use something like this:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
xmlns:p="http://some-namespace" targetNamespace="http://some-namespace"
elementFormDefault="qualified">