You may use the following Online XML data tools available on this site:
Related W3C specifications:
1) XML Schema Part 1: Structures Second Edition
2) XML Schema Part 2: Datatypes Second Edition
3) W3C XML Schema Definition Language (XSD) 1.1 Part 1: Structures
4) W3C XML Schema Definition Language (XSD) 1.1 Part 2: Datatypes
5) W3C XSLT specifications
6) W3C XPath specifications
7) XQuery 1.0 and XPath 2.0 F&O 2nd edition,
XPath and XQuery F&O 3.0,
XPath and XQuery F&O 3.1