xercesc c++ external entity resolve

[Aleksey Dobrunov]

Hi.
I have the following xml file:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE foo [
  <!ENTITY extern SYSTEM "ext.xml">
]>
<foo>
<foo_info>
<id >2011_0101</id>
<foo_name>foo foo</foo_name>
&extern;
</foo_info>
</foo>

in "ext.xml" I have additional xml tags.
I am using xerces 3.1.1 to parse the xml file using the following function:

xercesc::XercesDOMParser xml_parser;
XmlParserErrorHandler error_handler;
xml_parser.setErrorHandler(&error_handler);
xml_parser.setLoadExternalDTD(false);
xml_parser.setSkipDTDValidation(true);
xml_parser.parse(*current_input_source);
xercesc::DOMDocument *doc = xml_parser.getDocument();
xercesc::DOMElement *root = doc->getDocumentElement();

The problem I have is that the external ENTITY &extern is not resolved, the
parsed file in doc is missing it.

Does anyone have a suggestion on how to make xerces resolve it before
parsing?

Thanks,
Aleksey Dobrunov