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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/units/internal/library/UnitLibrary.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/units/internal/library/UnitLibrary.java
new file mode 100644
index 000000000..2d7cee19a
--- /dev/null
+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/units/internal/library/UnitLibrary.java
@@ -0,0 +1,182 @@
+/*******************************************************************************
+ *  Copyright (c) 2010 Association for Decentralized Information Management in
+ *  Industry THTH ry.
+ *  All rights reserved. This program and the accompanying materials
+ *  are made available under the terms of the Eclipse Public License v1.0
+ *  which accompanies this distribution, and is available at
+ *  http://www.eclipse.org/legal/epl-v10.html
+ *
+ *  Contributors:
+ *      VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.databoard.units.internal.library;
+
+import gnu.trove.map.hash.THashMap;
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.procedure.TObjectIntProcedure;
+import gnu.trove.procedure.TObjectObjectProcedure;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Set;
+
+import org.simantics.databoard.Units;
+import org.simantics.databoard.file.RuntimeIOException;
+import org.simantics.databoard.units.internal.UnitParseException;
+import org.simantics.databoard.units.internal.parser.UnitParser;
+
+public class UnitLibrary {
+
+	final THashMap<String, UnitConversion> conversions = 
+		new THashMap<String, UnitConversion>();
+
+	public Set<String> getUnits() {
+		return conversions.keySet();
+	}
+
+	public UnitConversion getConversion(String unit) {
+		return conversions.get(unit);
+	}
+	
+	private static final String[] PREFIXES = new String[] {
+		"y", "z", "a", "f", "p", "n", "µ", "m", "c", "d", "da", "h", "k", "M", "G", "T", "P", "E", "Z", "Y"
+	};
+	
+	private static final int[] PREFIX_MAGNITUDES = new int[] {
+		-24, -21, -18, -15, -12, -9, -6, -3, -2, -1, 1, 2, 3, 6, 9, 12, 15, 18, 21, 24
+	};
+	
+	
+	public static List<String> readTokens(InputStream stream) throws IOException {
+	    Reader reader = new InputStreamReader(stream);
+	    StringBuilder b = new StringBuilder();
+	    ArrayList<String> strings = new ArrayList<String>();
+	    while(true) {
+	        int c = reader.read();
+	        if(c == -1) {
+	            if(b.length() > 0)
+                    strings.add(b.toString());
+	            break;
+	        }
+	        if(c == ' ' || c == '\t' || c == '\n' || c == '\r') {
+	            if(b.length() > 0) {
+	                strings.add(b.toString());
+	                b.setLength(0);
+	            }
+	        }
+	        else
+	            b.append((char)c);
+	    }
+	    reader.close();
+	    return strings;
+	}
+		
+	private UnitConversion parseUnit(String unit) throws UnitParseException {	    
+	    final TObjectIntHashMap<String> exponents = new TObjectIntHashMap<String>(4);
+        final double[] scale = new double[] { 1.0 };
+        final int[] magnitude = new int[] { 0 };
+        new UnitParser() {
+            public void visit(String baseUnit, int exponent) {
+                UnitConversion conversion = conversions.get(baseUnit);
+                if(conversion == null) {
+                    if(exponents.adjustOrPutValue(baseUnit, exponent, exponent) == 0)
+                        exponents.remove(baseUnit);
+                }
+                else {
+                    scale[0] *= Math.pow(conversion.scale, exponent);
+                    magnitude[0] += conversion.magnitude * exponent;
+                    for(int i=0;i<conversion.baseUnits.length;++i) {
+                        String u = conversion.baseUnits[i];
+                        int exp = conversion.exponents[i]; 
+                        if(exponents.adjustOrPutValue(u, exp, exp) == 0)
+                            exponents.remove(u);
+                    }
+                }
+            }
+        }.unit(unit, 1);
+        final String[] unitArray = new String[exponents.size()];
+        final int[] exponentArray = new int[exponents.size()];
+        exponents.forEachEntry(new TObjectIntProcedure<String>() {
+            int i = 0;
+
+            @Override
+            public boolean execute(String arg0, int arg1) {
+                unitArray[i] = arg0;
+                exponentArray[i] = arg1;
+                ++i;
+                return true;
+            }
+        });
+        return new UnitConversion(
+            scale[0],
+            magnitude[0],
+            unitArray,
+            exponentArray
+            );
+	}
+	
+	public static UnitLibrary createDefault() {
+		UnitLibrary result = new UnitLibrary();
+		
+	    try {
+    	    for(String unit : readTokens( Units.class.getResourceAsStream("baseUnits.txt") ))
+    	        for(int i=0;i<PREFIXES.length;++i)
+    	            result.conversions.put(PREFIXES[i] + unit, 
+    	                new UnitConversion(1.0, PREFIX_MAGNITUDES[i], unit));
+    	    
+    	    {
+                List<String> units = readTokens( Units.class.getResourceAsStream("scalableDerivedUnits.txt") );              
+                for(int i=0;i<units.size();i+=3) {
+                    UnitConversion conversion = result.parseUnit(units.get(i+2));
+                    conversion.scale *= Double.parseDouble(units.get(i+1));
+                    String unit = units.get(i);
+                    result.conversions.put(unit, conversion);
+                    
+                    for(int j=0;j<PREFIXES.length;++j) {
+                        UnitConversion scaledConversion = 
+                            new UnitConversion(conversion.scale, 
+                                conversion.magnitude + PREFIX_MAGNITUDES[j],
+                                conversion.baseUnits, conversion.exponents);
+                        result.conversions.put(PREFIXES[j] + unit, scaledConversion);
+                    }
+                }
+            }    
+    	    
+    	    {
+    	        List<String> units = readTokens( Units.class.getResourceAsStream("nonscalableDerivedUnits.txt") );    	         
+    	        for(int i=0;i<units.size();i+=3) {
+    	            UnitConversion conversion = result.parseUnit(units.get(i+2));
+    	            conversion.scale *= Double.parseDouble(units.get(i+1));
+    	            result.conversions.put(units.get(i), conversion);
+    	        }
+    	    }
+    	    return result;
+    	                	    
+	    } catch (UnitParseException e) {
+	        throw new RuntimeException( e );
+        } catch (IOException e) {
+	        throw new RuntimeIOException( e );
+		}
+	    
+	}
+	
+	public static void main(String[] args) {
+		UnitLibrary lib = UnitLibrary.createDefault();
+	    lib.conversions.forEachEntry(new TObjectObjectProcedure<String, UnitConversion>() {
+
+            @Override
+            public boolean execute(String unit, UnitConversion conversion) {
+                System.out.println(unit + " = " + conversion.scale + 
+                    " * 10^" + conversion.magnitude + ", base=" + Arrays.toString(conversion.baseUnits));
+                return true;
+            }
+	     
+	    });
+    }
+	
+}