[ expat-Bugs-770765 ] why expat-1.95.6 can also NOT parse parameter entity ?

Bugs item #770765, was opened at 2003-07-13 19:44
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Category: XML::Parser (inactive)
Group: Feature Request
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: why expat-1.95.6 can also NOT parse parameter entity ?

Initial Comment:
Both expat-1.2 and expat-1.95.6 can NOT parse 
parameter entity. Who can tell me what reason is it 
for ? 

Just like the follow sample can NOT pass expat parser:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE aaa [
<!ENTITY % common "id  CDATA #REQUIRED">
<!ELEMENT aaa ANY>
<!ATTLIST aaa %common;>
]>
<aaa id="test"/>


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