--- a/POULibrary.py	Thu Jun 14 18:25:04 2012 +0200
+++ b/POULibrary.py	Thu Jun 14 18:50:28 2012 +0200
@@ -1,8 +1,8 @@
-from PLCControler import PLCControler
 from weakref import ref
 
 class POULibrary:
     def __init__(self, CTR, LibName, TypeStack):
+        from PLCControler import PLCControler
         self.CTR = ref(CTR)
         self.LibName = LibName
         self.LibraryControler = PLCControler()

--- a/ProjectController.py	Thu Jun 14 18:25:04 2012 +0200
+++ b/ProjectController.py	Thu Jun 14 18:50:28 2012 +0200
@@ -62,13 +62,13 @@
                 </xsd:choice>
               </xsd:complexType>
             </xsd:element>
-            <xsd:element name="Libraries" minOccurs="0">
+            <xsd:element name="Libraries" minOccurs="0">"""+(("""
               <xsd:complexType>
               """+"\n".join(['<xsd:attribute name='+
                              '"Enable_'+ libname + '_Library" '+
                              'type="xsd:boolean" use="optional" default="true"/>' 
                              for libname,lib in features.libraries])+"""
-              </xsd:complexType>
+              </xsd:complexType>""") if len(features.libraries)>0 else '<xsd:complexType/>') + """
             </xsd:element>
           </xsd:sequence>
           <xsd:attribute name="URI_location" type="xsd:string" use="optional" default=""/>
@@ -371,6 +371,8 @@
         return "\n".join([ lib.GetSTCode() for lib in self.Libraries ])
 
     def GetLibrariesCCode(self, buildpath):
+        if len(self.Libraries)==0:
+            return [],[],()
         self.GetIECProgramsAndVariables()
         LibIECCflags = '"-I%s"'%os.path.abspath(self.GetIECLibPath())
         LocatedCCodeAndFlags=[]