The scope of the function i.e. the declaration of the enclosing namespace/class/struct/union.
This element describes the declaration (qualified name lookup) of the enclosing namespace/class/struct/union. For global functions this element is empty.
See ISO/IEC 14882:2003(E) Section 3.3 Declarative regions and scopes [basic.scope]
Given this code:
namespace N { class C { struct D { int SomeFunction(); }; }; };
SomeFunction would have a scoped name element:
<cxxFunctionScopedName>N::C::D</cxxFunctionScopedName>