Sun's XACML Implementation

If a given schema-valid policy document contains an empty description
element ([Description][/Description] or [Description/]), AbstractPolicy
throws a NullPointerException in its constructor.

According to the XACML policy schema provided by OASIS, the datatype of the
Description element is xs:string. And according to
http://www.w3.org/TR/xmlschema-2/ an empty xs:string is a valid xs:string.

So either the schema should be updated to disallow empty strings, or the
parsing should account for this case.

The attached AbstractPolicy.java contains a small modification to the 1.2
source release's code (around line 220) which takes the latter route: it
checks for a null child and treats it the same as if the Description
element had not been specified at all in the policy document.