XPath and XACML

[Security Developer <security.developer22@gmail.com>]

Hi All,

Could any body please share some presentation or tutorial
 that explains usage of XPath and resource content in XACML. The reason 
of asking is, it is difficult for me to understand example XACML 
policies in XACML 3.0 core standard that uses XPath and XML resource 
content.

Thanks for you time.

Best Regards.