DOMLSParser: should I be using a XMLEntityResolver or DOMLSResourceResolver ?

[Ben Griffin]

I may be wrong ( I often am ), but it seems that when installing an  
XMLEntityResolver and a  DOMLSResourceResolver  into a DOMLSParser ,  
the one replaces the other.

I am not rightly sure that I know which one I should be using - and  
I'm also not rightly sure I know the purpose and difference between  
them, except for having different APIs.
I also do not really understand the advantages that one may have over  
the other.

http://xerces.apache.org/xerces-c/apiDocs-3/classXMLEntityResolver.html
"The parser will then allow the application to intercept any external  
entities (including the external DTD subset and external parameter  
entities, if any) before including them."

http://xerces.apache.org/xerces-c/apiDocs-3/classDOMLSResourceResolver.html
"The DOMLSParser will then allow the application to intercept any  
external entities (including the external DTD subset and external  
parameter entities) before including them."

I see that the XMLEntityResolver essentially returns an InputSource*,  
whereas the DOMLSResourceResolver returns a DOMLSInput*.

Thanks
        Ben.