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diff --git a/org.argeo.cms/src/org/argeo/cms/acr/CmsContent.java b/org.argeo.cms/src/org/argeo/cms/acr/CmsContent.java
new file mode 100644
index 000000000..184b2ce35
--- /dev/null
+++ b/org.argeo.cms/src/org/argeo/cms/acr/CmsContent.java
@@ -0,0 +1,53 @@
+package org.argeo.cms.acr;
+
+import java.util.Objects;
+
+import org.argeo.api.acr.Content;
+import org.argeo.api.acr.spi.ProvidedContent;
+
+/** A content within a CMS system. */
+public interface CmsContent extends ProvidedContent {
+
+	/**
+	 * Split a path (with {@link Content#PATH_SEPARATOR} separator) in an array of
+	 * length 2, the first part being the parent path (which could be either
+	 * absolute or relative), the second one being the last segment, (guaranteed to
+	 * be without a '/').
+	 */
+	static String[] getParentPath(String path) {
+		if (path == null)
+			throw new IllegalArgumentException("Path cannot be null");
+		if (path.length() == 0)
+			throw new IllegalArgumentException("Path cannot be empty");
+		ContentUtils.checkDoubleSlash(path);
+		int parentIndex = path.lastIndexOf(PATH_SEPARATOR);
+		if (parentIndex == path.length() - 1) {// trailing '/'
+			path = path.substring(0, path.length() - 1);
+			parentIndex = path.lastIndexOf(PATH_SEPARATOR);
+		}
+
+		if (parentIndex == -1) // no '/'
+			return new String[] { "", path };
+
+		return new String[] { parentIndex != 0 ? path.substring(0, parentIndex) : ContentUtils.PATH_SEPARATOR_STRING,
+				path.substring(parentIndex + 1) };
+	}
+
+	/**
+	 * Constructs a relative path between a base path and a given path.
+	 * 
+	 * @throws IllegalArgumentException if the base path is not an ancestor of the
+	 *                                  path
+	 */
+	static String relativize(String basePath, String path) throws IllegalArgumentException {
+		Objects.requireNonNull(basePath);
+		Objects.requireNonNull(path);
+		if (!path.startsWith(basePath))
+			throw new IllegalArgumentException(basePath + " is not an ancestor of " + path);
+		String relativePath = path.substring(basePath.length());
+		if (relativePath.length() > 0 && relativePath.charAt(0) == PATH_SEPARATOR)
+			relativePath = relativePath.substring(1);
+		return relativePath;
+	}
+
+}