<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def __xinclude_libxml2(target, source, env):
 """ Resolving XIncludes, using the libxml2 module. """

    doc = libxml2.readFile(str(source[0]), None, libxml2.XML_PARSE_NOENT)
    doc.xincludeProcessFlags(libxml2.XML_PARSE_NOENT)
    doc.saveFile(str(target[0]))
    doc.freeDoc()

    return None