sv中类的声明/嵌套

似水如烟

例子1：
class Outer;

int outerProp;

local int outerLocalProp;

static int outerStaticProp;

static local int outerLocalStaticProp;


class Inner;//类Inner为嵌套类

function void innerMethod(Outer h);
//类Outer声明

outerStaticProp = 0;// Legal, same as Outer:uterStaticProp

outerLocalStaticProp = 0;// Legal, nested classes may access local's in outer class

outerProp = 0;// Illegal, unqualified access to non-static outer

h.outerProp = 0;// Legal, qualified access.

h.outerLocalProp = 0;// Legal, qualified access and locals to outer class allowed.

endfunction

endclass
endclass

例子2：
class Packet;
    Packet next;
    function Packet get_next();// single line
        get_next = next;
    endfunction
// out-of-body (extern) declaration
    extern protected virtual function int send(int value);
endclass
function int Packet::send(int value);
// dropped protected virtual, added Packet::
// body of method
...
endfunction


这是在sv手册中看到的，代码中红色字体的声明应该怎么理解或者解释？

像例子1中红色字体的声明，如果它的位置位于类中其他成员变量定义的前面，还能像例子中的那种方式引用吗？