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diff --git a/knowledge/org.argeo.support.odk/src/org/argeo/support/odk/servlet/OdkManifestServlet.java b/knowledge/org.argeo.support.odk/src/org/argeo/support/odk/servlet/OdkManifestServlet.java
new file mode 100644
index 0000000..88b9c69
--- /dev/null
+++ b/knowledge/org.argeo.support.odk/src/org/argeo/support/odk/servlet/OdkManifestServlet.java
@@ -0,0 +1,108 @@
+package org.argeo.support.odk.servlet;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.Writer;
+import java.nio.charset.StandardCharsets;
+
+import javax.jcr.Node;
+import javax.jcr.NodeIterator;
+import javax.jcr.Property;
+import javax.jcr.Repository;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.nodetype.NodeType;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.argeo.cms.servlet.ServletAuthUtils;
+import org.argeo.jcr.Jcr;
+import org.argeo.jcr.JcrException;
+import org.argeo.support.odk.OrxManifestName;
+import org.argeo.util.DigestUtils;
+
+/** Describe additional files. */
+public class OdkManifestServlet extends HttpServlet {
+	private static final long serialVersionUID = 138030510865877478L;
+
+	private Repository repository;
+
+	@Override
+	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		resp.setContentType("text/xml; charset=utf-8");
+		resp.setHeader("X-OpenRosa-Version", "1.0");
+		resp.setDateHeader("Date", System.currentTimeMillis());
+
+		String pathInfo = req.getPathInfo();
+		if (pathInfo.startsWith("//"))
+			pathInfo = pathInfo.substring(1);
+
+		String serverName = req.getServerName();
+		int serverPort = req.getServerPort();
+		String protocol = serverPort == 443 || req.isSecure() ? "https" : "http";
+
+		Session session = ServletAuthUtils.doAs(() -> Jcr.login(repository, null), req);
+
+		try {
+			Node node = session.getNode(pathInfo);
+			if (node.isNodeType(OrxManifestName.manifest.get())) {
+				Writer writer = resp.getWriter();
+				writer.append("<?xml version='1.0' encoding='UTF-8' ?>");
+				writer.append("<manifest xmlns=\"http://openrosa.org/xforms/xformsManifest\">");
+				NodeIterator nit = node.getNodes();
+				while (nit.hasNext()) {
+					Node file = nit.nextNode();
+					if (file.isNodeType(OrxManifestName.mediaFile.get())) {
+						writer.append("<mediaFile>");
+
+						if (file.isNodeType(NodeType.NT_ADDRESS)) {
+							Node target = file.getProperty(Property.JCR_ID).getNode();
+							writer.append("<filename>");
+							writer.append(target.getPath().substring(1) + ".xml");
+							writer.append("</filename>");
+							try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
+								session.exportDocumentView(target.getPath(), out, true, false);
+								String fileCsum = DigestUtils.digest(DigestUtils.MD5, out.toByteArray());
+//						JcrxApi.addChecksum(file, fileCsum);
+								writer.append("<hash>");
+								writer.append("md5sum:" + fileCsum);
+								writer.append("</hash>");
+							}
+							writer.append("<downloadUrl>" + protocol + "://" + serverName
+									+ (serverPort == 80 || serverPort == 443 ? "" : ":" + serverPort)
+									+ "/api/odk/formManifest" + file.getPath() + "</downloadUrl>");
+						}
+						writer.append("</mediaFile>");
+					}
+				}
+
+				writer.append("</manifest>");
+			} else if (node.isNodeType(OrxManifestName.mediaFile.get())) {
+				if (node.isNodeType(NodeType.NT_ADDRESS)) {
+					Node target = node.getProperty(Property.JCR_ID).getNode();
+					try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
+						session.exportDocumentView(target.getPath(), out, true, false);
+						System.out.println(new String(out.toByteArray(), StandardCharsets.UTF_8));
+						resp.getOutputStream().write(out.toByteArray());
+					}
+				} else {
+					throw new IllegalArgumentException("Unsupported node " + node);
+				}
+			} else {
+				throw new IllegalArgumentException("Unsupported node " + node);
+			}
+		} catch (RepositoryException e) {
+			throw new JcrException(e);
+		} finally {
+			Jcr.logout(session);
+		}
+
+	}
+
+	public void setRepository(Repository repository) {
+		this.repository = repository;
+	}
+
+}