XercesDOMParser and XIncludes - c++

Question

I am attempting to get xincludes working in an existing system that uses a XercesDOMParser in xercesc to parse incoming xml from a client. I am working with Apache Xercesc v3.0.1, and the incoming XML, read from an input stream, is:
<?xml version="1.0" encoding="UTF-8"?>
<VisionServer xmlns:xi="http://www.w3.org/2001/XInclude">
<CompositeObject>
<xi:include href="testguioutput.xml" />
while testguioutput.xml contains
<?xml version="1.0" encoding="UTF-8"?>
<GUIOutput>
<Input>Input</Input>
<Title>IDC2_1</Title>
</GUIOutput>
The existing code uses a wrapper around a XercesDOMParser to parse the XML as it comes in, and after using setDoNamespaces and setDoXInclude to true, it is attempting to parse the XInclude, but I get a persistent "Fatal: include failed and no fallback element found in document '{0}'" error, no matter where in the directory structure I put testguioutput.xml.
I am working under visualstudio 2008, my working directory is default, and running out of /project/debug, but the include fails whether the target file is in /project/ or /project/debug/.

Answer 1

I was able to expand the xinclude tags using the XInclude.exe sample application that is included with the Xerces application. To do this, I created two files using your files above:
test1.xml:
<?xml version="1.0" encoding="UTF-8"?>
<VisionServer xmlns:xi="http://www.w3.org/2001/XInclude">
<CompositeObject>
<xi:include href="test2.xml"/>
</CompositeObject>
</VisionServer>
test2.xml:
<?xml version="1.0" encoding="UTF-8"?>
<GUIOutput>
<Input>Input</Input>
<Title>IDC2_1</Title>
</GUIOutput>
At the command line I executed:
"XInclude.exe test1.xml test1_expanded.xml" without quotes.
The resulting test1_expanded.xml file:
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<VisionServer xmlns="" xmlns:xi="http://www.w3.org/2001/XInclude">
<CompositeObject>
<GUIOutput xml:base="test2.xml">
<Input>Input</Input>
<Title>IDC2_1</Title>
</GUIOutput>
</CompositeObject>
</VisionServer>