DTD and Document

[gego]

I have problem with Entity definition.
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my file "test.xml"
----
<?xml version="1.0" ?>
<!DOCTYPE message [
<!ENTITY % PE "TEST1" >
<!ENTITY Ep "%PE;" >
]>
<message>&Ep;</message>
----
IE6 Error mesage ????
'Parameter entities cannot be used inside markup declarations in an internal subset.
<!ENTITY Ep "%PE;" >
------------^'
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But this is OK
------
my file "test_.xml"

<?xml version="1.0" ?>
<!DOCTYPE message [
<!ENTITY % PExt SYSTEM "PExt.dtd" >
%PExt;
]>
<message>&Ep;</message>
------
File "PExt.dtd"

<!ENTITY % PE "TEST1" >
<!ENTITY Ep "%PE;" >
-----
IE6

<?xml version="1.0" ?>
<!DOCTYPE message (View Source for full doctype...)>
<message>TEST1</message>
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