xml中关于外部实体的问题

 <?xml version="1.0" encoding="gb2312" ?>
<!DOCTYPE volume SYSTEM "D:\xml\Museum.dtd"[
    <!ENTITY Oldcoinses SYSTEM "D:\xml\Oldcoins.xml">
    <!ENTITY Oilpaintings SYSTEM "D:\xml\Oilpainting.xml">
    <!ENTITY Sculptures SYSTEM "D:\xml\Sculpture.xml">
]>
<volume>
&Oilpaintings;
&Oldcoinses;
&Sculptures;
</volume>

上面代码运行后出现错误:
This page contains the following errors:

error on line 3 at column 49: Invalid URI: D:\xml\Oldcoins.xml
error on line 4 at column 54: Invalid URI: D:\xml\Oilpainting.xml
error on line 5 at column 50: Invalid URI: D:\xml\Sculpture.xml
error on line 8 at column 15: Entity 'Oilpaintings' failed to parse
Below is a rendering of the page up to the first error.

刚接触这xml不懂,点拨一下,谢谢

xml的DOCTYPE怎么会使用本地的dtd呢,
以前很少人这么做,你应该是自己想测试dtd
D:/xml/Oldcoins.xml
file:///D:/xml/Oldcoins.xml
看看这样行不行