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+IEC 61131-3
+===========
+
+    IEC-61131 is a normative document provided by the standards organization IEC
+    (International Electrotechnical Commission) and describing a standard for
+    implementing programmable controllers.
+
+
+    The part 3 of this document (commonly named IEC 61131-3) specifies syntax and 
+    semantics for programming language for programmable controllers. Beremiz
+    implements all the languages described in this document. 
+
+
+    http://www.iec.eu
+        
+PLCopen TC6
+===========
+   
+    PLCopen is a vendor- and product-independent worldwide association defining
+    international standards for various topics related to control programming.
+    For this purpose, PLCopen has 6 technical committees.
+   
+   
+    The goal of the sixth committee (TC6) is to define a standard file format, 
+    based on XML, for exchanging programmables controllers programmed using 
+    IEC 61131-3 languages. Beremiz uses this file format for saving the PLC
+    programs of projects.
+   
+   
+    http://www.plcopen.org
+