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diff --git a/indra/llmessage/llexperiencecache.h b/indra/llmessage/llexperiencecache.h
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+/** 
+ * @file llexperiencecache.h
+ * @brief Caches information relating to experience keys
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+
+
+#ifndef LL_LLEXPERIENCECACHE_H
+#define LL_LLEXPERIENCECACHE_H
+
+#include "linden_common.h"
+#include <boost/signals2.hpp>
+
+class LLSD;
+class LLUUID;
+
+
+
+namespace LLExperienceCache
+{
+	const std::string PRIVATE_KEY	= "private_id";
+    const std::string MISSING       = "DoesNotExist";
+
+    const std::string AGENT_ID      = "agent_id";
+    const std::string GROUP_ID      = "group_id";
+	const std::string EXPERIENCE_ID	= "public_id";
+	const std::string NAME			= "name";
+	const std::string PROPERTIES	= "properties";
+	const std::string EXPIRES		= "expiration";  
+    const std::string DESCRIPTION	= "description";
+    const std::string QUOTA         = "quota";
+    const std::string MATURITY      = "maturity";
+    const std::string METADATA      = "extended_metadata";
+    const std::string SLURL         = "slurl";
+
+
+	// should be in sync with experience-api/experiences/models.py
+	const int PROPERTY_INVALID		= 1 << 0;
+	const int PROPERTY_PRIVILEGED	= 1 << 3;
+	const int PROPERTY_GRID			= 1 << 4;
+	const int PROPERTY_PRIVATE		= 1 << 5;
+	const int PROPERTY_DISABLED		= 1 << 6;  
+	const int PROPERTY_SUSPENDED	    = 1 << 7;
+
+
+	// default values
+	const static F64 DEFAULT_EXPIRATION = 600.0;
+	const static S32 DEFAULT_QUOTA = 128; // this is megabytes
+
+	// Callback types for get() below
+	typedef boost::signals2::signal<void (const LLSD& experience)>
+		callback_signal_t;
+	typedef callback_signal_t::slot_type callback_slot_t;
+	typedef std::map<LLUUID, LLSD> cache_t;
+
+
+	void setLookupURL(const std::string& lookup_url);
+	bool hasLookupURL();
+
+	void setMaximumLookups(int maximumLookups);
+
+	void idle();
+	void exportFile(std::ostream& ostr);
+	void importFile(std::istream& istr);
+	void initClass();
+	void bootstrap(const LLSD& legacyKeys, int initialExpiration);
+	
+	void erase(const LLUUID& key);
+	bool fetch(const LLUUID& key, bool refresh=false);
+	void insert(const LLSD& experience_data);
+	const LLSD& get(const LLUUID& key);
+
+	// If name information is in cache, callback will be called immediately.
+	void get(const LLUUID& key, callback_slot_t slot);
+
+	const cache_t& getCached();
+
+	// maps an experience private key to the experience id
+	LLUUID getExperienceId(const LLUUID& private_key, bool null_if_not_found=false);
+
+};
+
+#endif // LL_LLEXPERIENCECACHE_H