Using XSLTinputSource

[David Fishburn <fi...@ianywhere.com>]

Xalan 1.6
Xerces 2.3.0
WinXP
VC 6 sp5

I basically copied the StreamTransform code from Xalan 1.5 (just moved
to Xalan 1.6)

       istrstream	theXSLStream(xsl_str.c_str());

        XALAN_USING_XALAN(XalanDOMString);
        XALAN_USING_XALAN(XSLTInputSource);
        XALAN_USING_XALAN(XalanTransformer);
        XALAN_USING_XERCES(XMLPlatformUtils);

        XSLTInputSource		inputSource(&theXSLStream);
        inputSource.setSystemId(XalanDOMString("xsl").c_str());

Code that did work in Xalan 1.5 / Xerces 2.2.0, fails at the last line
above.
An exception is thrown, except I am not sure what I should catch,
inorder to display an appropriate error message (any suggestions?).

See my previous post on compiling the Debug version.

My main question is this:
What is this line doing:
        inputSource.setSystemId(XalanDOMString("xsl").c_str());

xsl_str.c_str() is a variable I create that has my XSL in it.
The xsl has xsl:include tags.
I had to write an entity resolver (problem with previous post) in order
to convert my:
    <xsl:include href="/xsl?name=genericStatusError.xsl" /> 

So that Xalan/Xerces gets this:
http://localhost/xsl?name=genericStatusError.xsl

I think this looks suspicious:
XalanDOMString("xsl").c_str()

The stream example had "foo", I replaced that with "xsl", but what
really is it doing?
After I wrote the entity Resolver, I see the systemID has the file
location that I stared the project from.
Could I do something like this:
 
inputSource.setSystemId(XalanDOMString("http://localhost").c_str());

And then not have to  worry about having to write an entity Resolver?

Thanks,
Dave