diff -r 8c98bad90b8d -r fcc406143e5b plcopen/plcopen.py
--- a/plcopen/plcopen.py	Thu Aug 17 10:12:04 2017 +0300
+++ b/plcopen/plcopen.py	Thu Aug 17 11:39:10 2017 +0300
@@ -154,7 +154,11 @@
 
 
 PLCOpenParser = GenerateParserFromXSD(paths.AbsNeighbourFile(__file__, "tc6_xml_v201.xsd"))
-PLCOpen_XPath = lambda xpath: etree.XPath(xpath, namespaces=PLCOpenParser.NSMAP)
+
+
+def PLCOpen_XPath(xpath):
+    return etree.XPath(xpath, namespaces=PLCOpenParser.NSMAP)
+
 
 LOAD_POU_PROJECT_TEMPLATE = """
 <project xmlns:ns1="http://www.plcopen.org/xml/tc6_0201"