Xerces, XInclude and PSVI

Hi,

I developed an Java application which use Xerces to manipulate XML files. The XML files have XSD schema files, which the application use it to validate the data.
Now, I try to put some XML file into an project file, which is an XML file with XInclude.
Now, the problem is that I'm not able anymore to get the PSVI for XML elements. In other words, when the XInclude is resolved, I cannot validate the included XML files. Even I configure the application to use Xerces 2.6.2 hopping that my problem will be solve, but it is still not working.
Maybe is just a meter of Xerces configuration, but I don't know what to do. If there is somebody which can help me, thank you in advance.