How to disable entity references conversion

[Rui Silva Torres]

Hi,
 
I am using a Java XML generator called toXgene that uses xerces.
This generator can get information of external sources (XML files), and
I gave to it an external xml file with entity references.
The problem is that it generates a xml file, where  all the entities
references were converted, and I want to preserve all the entities.
 
So, I suppose that the conversion is done by xerces, and  I want to know
if it is possible to configure xerces to preserve all the entities. 
 
Regards,
 
Rui Torres