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diff --git a/org.argeo.slc.agent/src/main/java/org/argeo/slc/dao/structure/tree/TreeSRegistryDao.java b/org.argeo.slc.agent/src/main/java/org/argeo/slc/dao/structure/tree/TreeSRegistryDao.java
new file mode 100644
index 000000000..f271f8cbe
--- /dev/null
+++ b/org.argeo.slc.agent/src/main/java/org/argeo/slc/dao/structure/tree/TreeSRegistryDao.java
@@ -0,0 +1,25 @@
+package org.argeo.slc.dao.structure.tree;
+
+import org.argeo.slc.core.structure.StructureRegistry;
+import org.argeo.slc.core.structure.tree.TreeSPath;
+import org.argeo.slc.core.structure.tree.TreeSRegistry;
+
+/**
+ * DAO for tree-base structure registry.
+ * 
+ * @see TreeSRegistry
+ */
+public interface TreeSRegistryDao {
+	/** Gets the TreeSRegistry which has the same root path as the provided path. */
+	public TreeSRegistry getActiveTreeSRegistry();
+
+	/** Creates a new registry. */
+	public void create(TreeSRegistry registry);
+
+	/** Updates an existing registry. */
+	public void update(TreeSRegistry registry);
+	
+	/** Sync with local registry */
+	public void syncPath(TreeSRegistry registry,
+			StructureRegistry<TreeSPath> localRegistry, TreeSPath path);
+}