docs: private boolean canBeSkipped (TypeRef importedClass) {
  		// skip known imported classes and the ones in JRE
  		if (allReferencedTypes.contains(importedClass) || importedReferencedTypes.contains(importedClass) || importedClass.isJava())
  			return true;
  		// Skip the imported classes which are excluded 
  		String classPackage = importedClass.getPackageRef().getFQN();
  		for (String excludePrefix: excludePrefixes) {		// skip by the package prefix
  			if (classPackage.startsWith(excludePrefix))
  				return true;
  		}
  		if (excludes.contains(classPackage))				// skip by the full package name
  			return true;
  		return classPackage.length()<2;						// special situation for the primitive array 
  	}