in cxf-xjc-plugin/src/main/java/org/apache/cxf/maven_plugin/XSDToJavaRunner.java [325:331]
protected String findExternalResource(String nsURI, String localName, Attributes atts) {
if ("http://www.w3.org/2001/XMLSchema".equals(nsURI)
&& ("import".equals(localName) || "include".equals(localName))) {
return atts.getValue("schemaLocation");
}
return null;
}