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diff --git a/runtime/org.argeo.slc.support.castor/src/main/java/org/argeo/slc/castor/structure/tree/TreeSPathFieldHandler.java b/runtime/org.argeo.slc.support.castor/src/main/java/org/argeo/slc/castor/structure/tree/TreeSPathFieldHandler.java
new file mode 100644
index 000000000..ad117ff14
--- /dev/null
+++ b/runtime/org.argeo.slc.support.castor/src/main/java/org/argeo/slc/castor/structure/tree/TreeSPathFieldHandler.java
@@ -0,0 +1,41 @@
+package org.argeo.slc.castor.structure.tree;
+
+import org.exolab.castor.mapping.AbstractFieldHandler;
+import org.exolab.castor.mapping.MapItem;
+
+import org.argeo.slc.core.structure.tree.TreeSPath;
+
+public class TreeSPathFieldHandler extends AbstractFieldHandler {
+
+	@Override
+	public Object getValue(Object object) throws IllegalStateException {
+		MapItem part = (MapItem) object;
+		return ((TreeSPath) part.getKey()).getAsUniqueString();
+	}
+
+	@Override
+	public Object newInstance(Object parent) throws IllegalStateException {
+		return null;
+	}
+
+	@Override
+	public Object newInstance(Object parent, Object[] args)
+			throws IllegalStateException {
+		return null;
+	}
+
+	@Override
+	public void resetValue(Object object) throws IllegalStateException,
+			IllegalArgumentException {
+		MapItem part = (MapItem) object;
+		part.setKey(null);
+	}
+
+	@Override
+	public void setValue(Object object, Object value)
+			throws IllegalStateException, IllegalArgumentException {
+		MapItem part = (MapItem) object;
+		part.setKey(TreeSPath.parseToCreatePath(value.toString()));
+	}
+
+}