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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIStringEnumerator;
+
+/**
+ * The XUL store is used to store information related to a XUL document/application.
+ * Typically it is used to store the persisted state for the document, such as
+ * window location, toolbars that are open and nodes that are open and closed in a tree.
+ *
+ * The data is serialized to [profile directory]/xulstore.json
+ */
+[scriptable, uuid(987c4b35-c426-4dd7-ad49-3c9fa4c65d20)]
+
+interface nsIXULStore: nsISupports
+{
+ /**
+ * Sets a value in the store.
+ *
+ * @param doc - document URI
+ * @param id - identifier of the node
+ * @param attr - attribute to store
+ * @param value - value of the attribute
+ */
+ void setValue(in AString doc, in AString id, in AString attr, in AString value);
+
+ /**
+ * Returns true if the store contains a value for attr.
+ *
+ * @param doc - URI of the document
+ * @param id - identifier of the node
+ * @param attr - attribute
+ */
+ bool hasValue(in AString doc, in AString id, in AString attr);
+
+ /**
+ * Retrieves a value in the store, or an empty string if it does not exist.
+ *
+ * @param doc - document URI
+ * @param id - identifier of the node
+ * @param attr - attribute to retrieve
+ *
+ * @returns the value of the attribute
+ */
+ AString getValue(in AString doc, in AString id, in AString attr);
+
+ /**
+ * Removes a value in the store.
+ *
+ * @param doc - document URI
+ * @param id - identifier of the node
+ * @param attr - attribute to remove
+ */
+ void removeValue(in AString doc, in AString id, in AString attr);
+
+ /**
+ * Iterates over all of the ids associated with a given document uri that
+ * have stored data.
+ *
+ * @param doc - document URI
+ */
+ nsIStringEnumerator getIDsEnumerator(in AString doc);
+
+ /**
+ * Iterates over all of the attributes associated with a given document uri
+ * and id that have stored data.
+ *
+ * @param doc - document URI
+ * @param id - identifier of the node
+ */
+ nsIStringEnumerator getAttributeEnumerator(in AString doc, in AString id);
+};