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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/NamespaceSpec.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/NamespaceSpec.java
new file mode 100644
index 000000000..3739edb52
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/NamespaceSpec.java
@@ -0,0 +1,60 @@
+package org.simantics.scl.compiler.environment;
+
+import gnu.trove.map.hash.THashMap;
+
+import java.util.Map;
+
+import org.simantics.scl.compiler.environment.NamespaceImpl.ModuleImport;
+
+public class NamespaceSpec {
+    public final THashMap<String, NamespaceSpec> namespaceMap = new THashMap<String, NamespaceSpec>();
+    public final THashMap<String, ModuleImport> moduleMap = new THashMap<String, ModuleImport>();
+    
+    public Namespace toNamespace() {
+        THashMap<String, Namespace> namespaceImplMap = new THashMap<String, Namespace>(namespaceMap.size());
+        for(Map.Entry<String, NamespaceSpec> entry : namespaceMap.entrySet())
+            namespaceImplMap.put(entry.getKey(), entry.getValue().toNamespace());
+        
+        return new NamespaceImpl(namespaceImplMap, moduleMap.values().toArray(new ModuleImport[moduleMap.size()]));
+    }
+    
+    public NamespaceSpec getNamespace(String name) {
+        NamespaceSpec result = namespaceMap.get(name);
+        if(result == null) {
+            result = new NamespaceSpec();
+            namespaceMap.put(name, result);
+        }
+        return result;
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder b = new StringBuilder();
+        toString(b);
+        return b.toString();
+    }
+
+    private void toString(StringBuilder b) {
+        b.append('[');
+        boolean first = true;
+        for(String name : moduleMap.keySet()) {
+            if(first)
+                first = false;
+            else
+                b.append(", ");
+            b.append(name);
+        }
+        b.append("]{");
+        first = true;
+        for(Map.Entry<String, NamespaceSpec> entry : namespaceMap.entrySet()) {
+            if(first)
+                first = false;
+            else
+                b.append(", ");
+            b.append(entry.getKey());
+            b.append('=');
+            entry.getValue().toString(b);
+        }
+        b.append('}');
+    }
+}