This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I am trying to represent java.util.HashMap as a schema definition assuming it can contain only java.lang.String as key and java.lang.String as value. Can anyone please tell me the difference between below 2 types of code specifically what does <extension base="xsd:string"> mean really ?