Your schema defines targetNamespace="http://www.w3schools.com"
and so instead of noNamespaceSchemaLocation you need to reference the XSD using the schemaLocation attribute.
xsi:schemaLocation="http://www.w3schools.com jobList.xsd"
Things to consider:
- you could reference multiple XSDs for multiple namespaces; form a pair for each, as shown above.
And
According to the World Wide Web Consortium (W3C) XML Schema Recommendation, XML instance documents can have both xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes specified. In addition, you can list the same namespace several times.