diff --git a/libguh/devicemanager.cpp b/libguh/devicemanager.cpp
index 9062dba3..5a6429b8 100644
--- a/libguh/devicemanager.cpp
+++ b/libguh/devicemanager.cpp
@@ -412,7 +412,6 @@ void DeviceManager::loadConfiguredDevices()
             settings.beginGroup(paramNameString);
             Param param(paramNameString.remove(QRegExp("Param-")));
             param.setValue(settings.value("value"));
-            param.setOperand((Param::OperandType)settings.value("operand").toInt());
             params.append(param);
             settings.endGroup();
         }
@@ -439,7 +438,6 @@ void DeviceManager::storeConfiguredDevices()
         foreach (const Param &param, device->params()) {
             settings.beginGroup("Param-" + param.name());
             settings.setValue("value", param.value());
-            settings.setValue("operand", param.operand());
             settings.endGroup();
         }
         settings.endGroup();
diff --git a/libguh/libguh.pro b/libguh/libguh.pro
index bd873d29..0889914c 100644
--- a/libguh/libguh.pro
+++ b/libguh/libguh.pro
@@ -19,9 +19,11 @@ SOURCES += plugin/device.cpp \
            types/statetype.cpp \
            types/eventtype.cpp \
            types/event.cpp \
+           types/eventdescriptor.cpp \
            types/vendor.cpp \
            types/paramtype.cpp \
-    types/param.cpp
+           types/param.cpp \
+           types/paramdescriptor.cpp \
 
 HEADERS += plugin/device.h \
            plugin/deviceclass.h \
@@ -36,8 +38,10 @@ HEADERS += plugin/device.h \
            types/statetype.h \
            types/eventtype.h \
            types/event.h \
+           types/eventdescriptor.h \
            types/vendor.h \
            types/typeutils.h \
            types/paramtype.h \
-    types/param.h
+           types/param.h \
+           types/paramdescriptor.h
 
diff --git a/libguh/types/eventdescriptor.cpp b/libguh/types/eventdescriptor.cpp
new file mode 100644
index 00000000..a9668c4d
--- /dev/null
+++ b/libguh/types/eventdescriptor.cpp
@@ -0,0 +1,152 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *                                                                         *
+ *  This file is part of guh.                                              *
+ *                                                                         *
+ *  Guh is free software: you can redistribute it and/or modify            *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation, version 2 of the License.                *
+ *                                                                         *
+ *  Guh 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 General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with guh. If not, see <http://www.gnu.org/licenses/>.            *
+ *                                                                         *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*!
+    \class EventDescriptor
+    \brief Describes a certain \l{Event}.
+
+    \ingroup types
+    \inmodule libguh
+
+    An EventDescriptor describes an \l{Event} in order to match it with a \l{Rule}.
+
+    \sa Event, Rule
+*/
+
+#include "eventdescriptor.h"
+
+/*! Constructs an EventDescriptor describing an Event.
+ */
+EventDescriptor::EventDescriptor(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QList<ParamDescriptor> &paramDescriptors):
+    m_eventTypeId(eventTypeId),
+    m_deviceId(deviceId),
+    m_paramDescriptors(paramDescriptors)
+{
+}
+
+/*! Returns the id of the \l{EventType} which describes this Event.*/
+EventTypeId EventDescriptor::eventTypeId() const
+{
+    return m_eventTypeId;
+}
+
+/*! Returns the id of the \l{Device} associated with this Event.*/
+DeviceId EventDescriptor::deviceId() const
+{
+    return m_deviceId;
+}
+
+/*! Returns the parameters of this Event.*/
+QList<ParamDescriptor> EventDescriptor::paramDescriptors() const
+{
+    return m_paramDescriptors;
+}
+
+/*! Set the parameters of this Event to \a params.*/
+void EventDescriptor::setParamDescriptors(const QList<ParamDescriptor> &paramDescriptors)
+{
+    m_paramDescriptors = paramDescriptors;
+}
+
+ParamDescriptor EventDescriptor::paramDescriptor(const QString &paramDescriptorName) const
+{
+    foreach (const ParamDescriptor &paramDescriptor, m_paramDescriptors) {
+        if (paramDescriptor.name() == paramDescriptorName) {
+            return paramDescriptor;
+        }
+    }
+    return ParamDescriptor(QString());
+}
+
+/*! Compare this Event to the Event given by \a other.
+    Events are equal (returns true) if eventTypeId, deviceId and params match. */
+bool EventDescriptor::operator ==(const EventDescriptor &other) const
+{
+    bool paramsMatch = true;
+    foreach (const ParamDescriptor &otherParamDescriptor, other.paramDescriptors()) {
+        ParamDescriptor paramDescriptor = this->paramDescriptor(otherParamDescriptor.name());
+        if (!paramDescriptor.isValid() || paramDescriptor.value() != otherParamDescriptor.value()) {
+            paramsMatch = false;
+            break;
+        }
+    }
+
+    return m_eventTypeId == other.eventTypeId()
+            && m_deviceId == other.deviceId()
+            && paramsMatch;
+}
+
+bool EventDescriptor::operator ==(const Event &event) const
+{
+    if (m_eventTypeId != event.eventTypeId() || m_deviceId != event.deviceId()) {
+        return false;
+    }
+
+    foreach (const ParamDescriptor &paramDescriptor, m_paramDescriptors) {
+        switch (paramDescriptor.operand()) {
+        case ParamDescriptor::OperandTypeEquals:
+            if (event.param(paramDescriptor.name()).value() != paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        case ParamDescriptor::OperandTypeNotEquals:
+            if (event.param(paramDescriptor.name()).value() == paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        case ParamDescriptor::OperandTypeGreater:
+            if (event.param(paramDescriptor.name()).value() <= paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        case ParamDescriptor::OperandTypeGreaterOrEqual:
+            if (event.param(paramDescriptor.name()).value() < paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        case ParamDescriptor::OperandTypeLess:
+            if (event.param(paramDescriptor.name()).value() >= paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        case ParamDescriptor::OperandTypeLessOrEqual:
+            if (event.param(paramDescriptor.name()).value() < paramDescriptor.value()) {
+                return false;
+            }
+            break;
+        }
+    }
+    return true;
+}
+
+QDebug operator<<(QDebug dbg, const EventDescriptor &eventDescriptor)
+{
+    dbg.nospace() << "EventDescriptor(EventTypeId: " << eventDescriptor.eventTypeId().toString() << ", DeviceId" << eventDescriptor.deviceId() << ")";
+
+    return dbg.space();
+}
+
+QDebug operator<<(QDebug dbg, const QList<EventDescriptor> &eventDescriptors)
+{
+    dbg.nospace() << "EventDescriptorList (count:" << eventDescriptors.count() << ")";
+    for (int i = 0; i < eventDescriptors.count(); i++ ) {
+        dbg.nospace() << "     " << i << ": " << eventDescriptors.at(i);
+    }
+
+    return dbg.space();
+}
diff --git a/libguh/types/eventdescriptor.h b/libguh/types/eventdescriptor.h
new file mode 100644
index 00000000..b666a748
--- /dev/null
+++ b/libguh/types/eventdescriptor.h
@@ -0,0 +1,54 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *                                                                         *
+ *  This file is part of guh.                                              *
+ *                                                                         *
+ *  Guh is free software: you can redistribute it and/or modify            *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation, version 2 of the License.                *
+ *                                                                         *
+ *  Guh 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 General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with guh. If not, see <http://www.gnu.org/licenses/>.            *
+ *                                                                         *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef EVENTDESCRIPTOR_H
+#define EVENTDESCRIPTOR_H
+
+#include "typeutils.h"
+#include "paramdescriptor.h"
+#include "event.h"
+
+#include <QString>
+#include <QVariantList>
+#include <QDebug>
+
+class EventDescriptor
+{
+public:
+    EventDescriptor(const EventTypeId &eventTypeId, const DeviceId &deviceId, const QList<ParamDescriptor> &paramDescriptors = QList<ParamDescriptor>());
+
+    EventTypeId eventTypeId() const;
+    DeviceId deviceId() const;
+
+    QList<ParamDescriptor> paramDescriptors() const;
+    void setParamDescriptors(const QList<ParamDescriptor> &paramDescriptors);
+    ParamDescriptor paramDescriptor(const QString &paramDescriptorName) const;
+
+    bool operator ==(const EventDescriptor &other) const;
+
+    bool operator ==(const Event &event) const;
+
+private:
+    EventTypeId m_eventTypeId;
+    DeviceId m_deviceId;
+    QList<ParamDescriptor> m_paramDescriptors;
+};
+QDebug operator<<(QDebug dbg, const EventDescriptor &eventDescriptor);
+QDebug operator<<(QDebug dbg, const QList<EventDescriptor> &eventDescriptors);
+
+#endif // EVENTDESCRIPTOR_H
diff --git a/libguh/types/param.cpp b/libguh/types/param.cpp
index 07645788..6bb19f28 100644
--- a/libguh/types/param.cpp
+++ b/libguh/types/param.cpp
@@ -22,8 +22,7 @@
 
 Param::Param(const QString &name, const QVariant &value):
     m_name (name),
-    m_value(value),
-    m_operand(OperandTypeEquals)
+    m_value(value)
 {
 }
 
@@ -47,16 +46,6 @@ void Param::setValue(const QVariant &value)
     m_value = value;
 }
 
-Param::OperandType Param::operand() const
-{
-    return m_operand;
-}
-
-void Param::setOperand(Param::OperandType operand)
-{
-    m_operand = operand;
-}
-
 bool Param::isValid() const
 {
     return !m_name.isEmpty() && m_value.isValid();
diff --git a/libguh/types/param.h b/libguh/types/param.h
index b1733824..e17ad4bd 100644
--- a/libguh/types/param.h
+++ b/libguh/types/param.h
@@ -25,15 +25,6 @@
 class Param
 {
 public:
-    enum OperandType {
-        OperandTypeEquals,
-        OperandTypeNotEquals,
-        OperandTypeLess,
-        OperandTypeGreater,
-        OperandTypeLessThan,
-        OperandTypeGreaterThan
-    };
-
     Param(const QString &name, const QVariant &value = QVariant());
 
     QString name() const;
@@ -42,15 +33,11 @@ public:
     QVariant value() const;
     void setValue(const QVariant &value);
 
-    OperandType operand() const;
-    void setOperand(OperandType operand);
-
     bool isValid() const;
 
 private:
     QString m_name;
     QVariant m_value;
-    OperandType m_operand;
 };
 
 QDebug operator<<(QDebug dbg, const Param &param);
diff --git a/libguh/types/paramdescriptor.cpp b/libguh/types/paramdescriptor.cpp
new file mode 100644
index 00000000..c041edc6
--- /dev/null
+++ b/libguh/types/paramdescriptor.cpp
@@ -0,0 +1,18 @@
+#include "paramdescriptor.h"
+
+ParamDescriptor::ParamDescriptor(const QString &name, const QVariant &value):
+    Param(name, value),
+    m_operand(OperandTypeEquals)
+{
+}
+
+ParamDescriptor::OperandType ParamDescriptor::operand() const
+{
+    return m_operand;
+}
+
+void ParamDescriptor::setOperand(ParamDescriptor::OperandType operand)
+{
+    m_operand = operand;
+}
+
diff --git a/libguh/types/paramdescriptor.h b/libguh/types/paramdescriptor.h
new file mode 100644
index 00000000..f1dd4d82
--- /dev/null
+++ b/libguh/types/paramdescriptor.h
@@ -0,0 +1,26 @@
+#ifndef PARAMDESCRIPTOR_H
+#define PARAMDESCRIPTOR_H
+
+#include "param.h"
+
+class ParamDescriptor : public Param
+{
+public:
+    enum OperandType {
+        OperandTypeEquals,
+        OperandTypeNotEquals,
+        OperandTypeLess,
+        OperandTypeGreater,
+        OperandTypeLessOrEqual,
+        OperandTypeGreaterOrEqual
+    };
+    ParamDescriptor(const QString &name, const QVariant &value = QVariant());
+
+    OperandType operand() const;
+    void setOperand(OperandType operand);
+
+private:
+    OperandType m_operand;
+};
+
+#endif // PARAMDESCRIPTOR_H
diff --git a/server/jsonrpc/jsontypes.cpp b/server/jsonrpc/jsontypes.cpp
index 6b41533f..e895f577 100644
--- a/server/jsonrpc/jsontypes.cpp
+++ b/server/jsonrpc/jsontypes.cpp
@@ -35,10 +35,12 @@ QVariantList JsonTypes::s_operandTypes;
 
 QVariantMap JsonTypes::s_paramType;
 QVariantMap JsonTypes::s_param;
+QVariantMap JsonTypes::s_paramDescriptor;
 QVariantMap JsonTypes::s_stateType;
 QVariantMap JsonTypes::s_state;
 QVariantMap JsonTypes::s_eventType;
 QVariantMap JsonTypes::s_event;
+QVariantMap JsonTypes::s_eventDescriptor;
 QVariantMap JsonTypes::s_actionType;
 QVariantMap JsonTypes::s_action;
 QVariantMap JsonTypes::s_plugin;
@@ -67,7 +69,11 @@ void JsonTypes::init()
     // Param
     s_param.insert("name", "string");
     s_param.insert("value", basicTypesRef());
-    s_param.insert("operand", operandTypesRef());
+
+    // ParamDescriptor
+    s_paramDescriptor.insert("name", "string");
+    s_paramDescriptor.insert("value", basicTypesRef());
+    s_paramDescriptor.insert("operand", operandTypesRef());
 
     // StateType
     s_stateType.insert("id", "uuid");
@@ -90,6 +96,11 @@ void JsonTypes::init()
     s_event.insert("deviceId", "uuid");
     s_event.insert("o:params", QVariantList() << paramRef());
 
+    // EventDescriptor
+    s_eventDescriptor.insert("eventTypeId", "uuid");
+    s_eventDescriptor.insert("deviceId", "uuid");
+    s_eventDescriptor.insert("o:paramDescriptors", QVariantList() << paramDescriptorRef());
+
     // ActionType
     s_actionType.insert("id", "uuid");
     s_actionType.insert("name", "string");
@@ -130,9 +141,10 @@ void JsonTypes::init()
     s_deviceDescriptor.insert("title", "string");
     s_deviceDescriptor.insert("description", "string");
 
+    // Rule
     s_rule.insert("id", "uuid");
     s_rule.insert("ruleType", ruleTypesRef());
-    s_rule.insert("events", QVariantList() << eventRef());
+    s_rule.insert("eventDescriptors", QVariantList() << eventDescriptorRef());
     s_rule.insert("actions", QVariantList() << actionRef());
     s_rule.insert("states", QVariantList() << stateRef());
 
@@ -153,14 +165,16 @@ QVariantMap JsonTypes::allTypes()
     allTypes.insert("SetupMethodType", setupMethodTypes());
     allTypes.insert("OperandType", operandTypes());
     allTypes.insert("StateType", stateTypeDescription());
+    allTypes.insert("Event", eventDescription());
     allTypes.insert("EventType", eventTypeDescription());
+    allTypes.insert("EventDescriptor", eventDescriptorDescription());
     allTypes.insert("ActionType", actionTypeDescription());
     allTypes.insert("Vendor", vendorDescription());
     allTypes.insert("DeviceClass", deviceClassDescription());
     allTypes.insert("Plugin", pluginDescription());
     allTypes.insert("Param", paramDescription());
+    allTypes.insert("ParamDescriptor", paramDescriptorDescription());
     allTypes.insert("State", stateDescription());
-    allTypes.insert("Event", eventDescription());
     allTypes.insert("Device", deviceDescription());
     allTypes.insert("DeviceDescriptor", deviceDescriptorDescription());
     allTypes.insert("Action", actionDescription());
@@ -191,6 +205,19 @@ QVariantMap JsonTypes::packEvent(const Event &event)
     return variant;
 }
 
+QVariantMap JsonTypes::packEventDescriptor(const EventDescriptor &eventDescriptor)
+{
+    QVariantMap variant;
+    variant.insert("eventTypeId", eventDescriptor.eventTypeId());
+    variant.insert("deviceId", eventDescriptor.deviceId());
+    QVariantList params;
+    foreach (const ParamDescriptor &paramDescriptor, eventDescriptor.paramDescriptors()) {
+        params.append(packParamDescriptor(paramDescriptor));
+    }
+    variant.insert("params", params);
+    return variant;
+}
+
 QVariantMap JsonTypes::packActionType(const ActionType &actionType)
 {
     QVariantMap variantMap;
@@ -226,9 +253,16 @@ QVariantMap JsonTypes::packStateType(const StateType &stateType)
 QVariantMap JsonTypes::packParam(const Param &param)
 {
     QVariantMap variantMap;
-    variantMap.insert("name", param.name());
-    variantMap.insert("value", param.value());
-    variantMap.insert("operand", s_operandTypes.at(param.operand()));
+    variantMap.insert(param.name(), param.value());
+    return variantMap;
+}
+
+QVariantMap JsonTypes::packParamDescriptor(const ParamDescriptor &paramDescriptor)
+{
+    QVariantMap variantMap;
+    variantMap.insert("name", paramDescriptor.name());
+    variantMap.insert("value", paramDescriptor.value());
+    variantMap.insert("operand", s_operandTypes.at(paramDescriptor.operand()));
     return variantMap;
 }
 
@@ -322,11 +356,11 @@ QVariantMap JsonTypes::packRule(const Rule &rule)
 {
     QVariantMap ruleMap;
     ruleMap.insert("id", rule.id());
-    QVariantList eventList;
-    foreach (const Event &event, rule.events()) {
-        eventList.append(JsonTypes::packEvent(event));
+    QVariantList eventDescriptorList;
+    foreach (const EventDescriptor &eventDescriptor, rule.eventDescriptors()) {
+        eventDescriptorList.append(JsonTypes::packEventDescriptor(eventDescriptor));
     }
-    ruleMap.insert("events", eventList);
+    ruleMap.insert("eventDescriptors", eventDescriptorList);
 
     ruleMap.insert("ruleType", s_ruleTypes.at(rule.ruleType()));
 
@@ -343,22 +377,7 @@ QVariantMap JsonTypes::packRule(const Rule &rule)
 
 Param JsonTypes::unpackParam(const QVariantMap &paramMap)
 {
-    Param param(paramMap.value("name").toString(), paramMap.value("value"));
-    QString operandString = paramMap.value("operand").toString();
-    if (operandString == "OperandTypeEquals") {
-        param.setOperand(Param::OperandTypeEquals);
-    } else if (operandString == "OperandTypeNotEquals") {
-        param.setOperand(Param::OperandTypeNotEquals);
-    } else if (operandString == "OperandTypeLess") {
-        param.setOperand(Param::OperandTypeLess);
-    } else if (operandString == "OperandTypeGreater") {
-        param.setOperand(Param::OperandTypeGreater);
-    } else if (operandString == "OperandTypeLessThan") {
-        param.setOperand(Param::OperandTypeLessThan);
-    } else if (operandString == "OperandTypeGreaterThan") {
-        param.setOperand(Param::OperandTypeGreaterThan);
-    }
-    return param;
+    return Param(paramMap.value("name").toString(), paramMap.value("value"));
 }
 
 QList<Param> JsonTypes::unpackParams(const QVariantList &paramList)
@@ -370,6 +389,35 @@ QList<Param> JsonTypes::unpackParams(const QVariantList &paramList)
     return params;
 }
 
+ParamDescriptor JsonTypes::unpackParamDescriptor(const QVariantMap &paramMap)
+{
+    ParamDescriptor param(paramMap.value("name").toString(), paramMap.value("value"));
+    QString operandString = paramMap.value("operand").toString();
+    if (operandString == "OperandTypeEquals") {
+        param.setOperand(ParamDescriptor::OperandTypeEquals);
+    } else if (operandString == "OperandTypeNotEquals") {
+        param.setOperand(ParamDescriptor::OperandTypeNotEquals);
+    } else if (operandString == "OperandTypeLess") {
+        param.setOperand(ParamDescriptor::OperandTypeLess);
+    } else if (operandString == "OperandTypeGreater") {
+        param.setOperand(ParamDescriptor::OperandTypeGreater);
+    } else if (operandString == "OperandTypeLessOrEqual") {
+        param.setOperand(ParamDescriptor::OperandTypeLessOrEqual);
+    } else if (operandString == "OperandTypeGreaterOrEqual") {
+        param.setOperand(ParamDescriptor::OperandTypeGreaterOrEqual);
+    }
+    return param;
+}
+
+QList<ParamDescriptor> JsonTypes::unpackParamDescriptors(const QVariantList &paramList)
+{
+    QList<ParamDescriptor> params;
+    foreach (const QVariant &paramVariant, paramList) {
+        params.append(unpackParamDescriptor(paramVariant.toMap()));
+    }
+    return params;
+}
+
 QPair<bool, QString> JsonTypes::validateMap(const QVariantMap &templateMap, const QVariantMap &map)
 {
     s_lastError.clear();
@@ -471,10 +519,8 @@ QPair<bool, QString> JsonTypes::validateVariant(const QVariant &templateVariant,
                     return result;
                 }
             } else if (refName == paramRef()) {
-                QPair<bool, QString> result = validateMap(paramDescription(), variant.toMap());
-                if (!result.first) {
-                    qDebug() << "Param not valid";
-                    return result;
+                if (!variant.canConvert(QVariant::Map)) {
+                    report(false, "Param not valid. Should be a map.");
                 }
             } else if (refName == deviceRef()) {
                 QPair<bool, QString> result = validateMap(deviceDescription(), variant.toMap());
diff --git a/server/jsonrpc/jsontypes.h b/server/jsonrpc/jsontypes.h
index b3b03779..e241ec81 100644
--- a/server/jsonrpc/jsontypes.h
+++ b/server/jsonrpc/jsontypes.h
@@ -27,6 +27,7 @@
 #include "types/action.h"
 #include "types/actiontype.h"
 #include "types/paramtype.h"
+#include "types/paramdescriptor.h"
 
 #include <QObject>
 
@@ -70,10 +71,12 @@ public:
     DECLARE_TYPE(operandTypes, "OperandType")
     DECLARE_OBJECT(paramType, "ParamType")
     DECLARE_OBJECT(param, "Param")
+    DECLARE_OBJECT(paramDescriptor, "ParamDescriptor")
     DECLARE_OBJECT(stateType, "StateType")
     DECLARE_OBJECT(state, "State")
     DECLARE_OBJECT(eventType, "EventType")
     DECLARE_OBJECT(event, "Event")
+    DECLARE_OBJECT(eventDescriptor, "EventDescriptor")
     DECLARE_OBJECT(actionType, "ActionType")
     DECLARE_OBJECT(action, "Action")
     DECLARE_OBJECT(plugin, "Plugin")
@@ -85,11 +88,13 @@ public:
 
     static QVariantMap packEventType(const EventType &eventType);
     static QVariantMap packEvent(const Event &event);
+    static QVariantMap packEventDescriptor(const EventDescriptor &event);
     static QVariantMap packActionType(const ActionType &actionType);
     static QVariantMap packAction(const Action &action);
     static QVariantMap packStateType(const StateType &stateType);
     static QVariantMap packParam(const Param &param);
     static QVariantMap packParamType(const ParamType &paramType);
+    static QVariantMap packParamDescriptor(const ParamDescriptor &paramDescriptor);
     static QVariantMap packVendor(const Vendor &vendor);
     static QVariantMap packDeviceClass(const DeviceClass &deviceClass);
     static QVariantMap packPlugin(DevicePlugin *plugin);
@@ -99,6 +104,8 @@ public:
 
     static Param unpackParam(const QVariantMap &paramMap);
     static QList<Param> unpackParams(const QVariantList &paramList);
+    static ParamDescriptor unpackParamDescriptor(const QVariantMap &paramDescriptorMap);
+    static QList<ParamDescriptor> unpackParamDescriptors(const QVariantList &paramDescriptorList);
 
     static QPair<bool, QString> validateMap(const QVariantMap &templateMap, const QVariantMap &map);
     static QPair<bool, QString> validateProperty(const QVariant &templateValue, const QVariant &value);
diff --git a/server/jsonrpc/ruleshandler.cpp b/server/jsonrpc/ruleshandler.cpp
index 16f213f1..9c017fa7 100644
--- a/server/jsonrpc/ruleshandler.cpp
+++ b/server/jsonrpc/ruleshandler.cpp
@@ -39,7 +39,7 @@ RulesHandler::RulesHandler(QObject *parent) :
 
     params.clear(); returns.clear();
     setDescription("AddRule", "Add a rule");
-    params.insert("event", JsonTypes::eventRef());
+    params.insert("eventDescriptor", JsonTypes::eventDescriptorRef());
     QVariantList actions;
     actions.append(JsonTypes::actionRef());
     params.insert("actions", actions);
@@ -82,8 +82,8 @@ JsonReply* RulesHandler::AddRule(const QVariantMap &params)
 
     EventTypeId eventTypeId(eventMap.value("eventTypeId").toString());
     DeviceId eventDeviceId(eventMap.value("deviceId").toString());
-    QList<Param> eventParams = JsonTypes::unpackParams(eventMap.value("params").toList());
-    Event event(eventTypeId, eventDeviceId, eventParams);
+    QList<ParamDescriptor> eventParams = JsonTypes::unpackParamDescriptors(eventMap.value("paramDescriptors").toList());
+    EventDescriptor eventDescriptor(eventTypeId, eventDeviceId, eventParams);
 
     QList<Action> actions;
     QVariantList actionList = params.value("actions").toList();
@@ -102,7 +102,7 @@ JsonReply* RulesHandler::AddRule(const QVariantMap &params)
         return createReply(returns);
     }
 
-    switch(GuhCore::instance()->ruleEngine()->addRule(event, actions)) {
+    switch(GuhCore::instance()->ruleEngine()->addRule(eventDescriptor, actions)) {
     case RuleEngine::RuleErrorNoError:
         returns.insert("success", true);
         returns.insert("errorMessage", "");
diff --git a/server/rule.cpp b/server/rule.cpp
index 1aaf1afc..1347aa10 100644
--- a/server/rule.cpp
+++ b/server/rule.cpp
@@ -23,13 +23,13 @@
     \ingroup rules
     \inmodule server
 
-    A Rule is always evented by an \l{Event}, has \l{State}{States}
+    A Rule is always triggered by an \l{EventDescriptor}, has \l{State}{States}
     to be compared and \l{Action}{Actions} to be executed. Additionally a
     Rule is either of type \l{Rule::RuleTypeAll} or \l{Rule::RuleTypeAny}
     which determines if all or any of the \l{State}{States} must be matching
     in order for the \l{Action}{Actions} to be executed.
 
-    \sa Event, State, Action
+    \sa EventDescriptor, State, Action
 */
 
 /*! \enum Rule::RuleType
@@ -48,11 +48,11 @@
 
 #include <QDebug>
 
-/*! Constructs a Rule with the given \a id, \a event, \a states and \a actions. The ruleType will default to
+/*! Constructs a Rule with the given \a id, \a eventDescriptor, \a states and \a actions. The ruleType will default to
  \l{Rule::RuleTypeAll}.*/
-Rule::Rule(const QUuid &id, const Event &event, const QList<State> &states, const QList<Action> &actions):
+Rule::Rule(const QUuid &id, const EventDescriptor &eventDescriptor, const QList<State> &states, const QList<Action> &actions):
     m_id(id),
-    m_events(QList<Event>() << event),
+    m_eventDescriptors(QList<EventDescriptor>() << eventDescriptor),
     m_states(states),
     m_actions(actions),
     m_ruleType(RuleTypeAll)
@@ -65,10 +65,10 @@ QUuid Rule::id() const
     return m_id;
 }
 
-/*! Returns the \l{Event} that events this Rule.*/
-QList<Event> Rule::events() const
+/*! Returns the \l{EventDescriptor} for this Rule.*/
+QList<EventDescriptor> Rule::eventDescriptors() const
 {
-    return m_events;
+    return m_eventDescriptors;
 }
 
 /*! Returns the \l{State}{States} that need to be matching in order for this to Rule apply. */
@@ -77,7 +77,7 @@ QList<State> Rule::states() const
     return m_states;
 }
 
-/*! Returns the \l{Action}{Actions} to be executed when this Rule is eventd and states match. */
+/*! Returns the \l{Action}{Actions} to be executed when this Rule is matched and states match. */
 QList<Action> Rule::actions() const
 {
     return m_actions;
diff --git a/server/rule.h b/server/rule.h
index 548ec184..d5c24a8a 100644
--- a/server/rule.h
+++ b/server/rule.h
@@ -21,7 +21,7 @@
 
 #include "types/state.h"
 #include "types/action.h"
-#include "types/event.h"
+#include "types/eventdescriptor.h"
 #include "stateevaluator.h"
 
 #include <QUuid>
@@ -34,10 +34,10 @@ public:
         RuleTypeAny
     };
 
-    Rule(const QUuid &id, const Event &event, const QList<State> &states, const QList<Action> &actions);
+    Rule(const QUuid &id, const EventDescriptor &eventDescriptor, const QList<State> &states, const QList<Action> &actions);
 
     QUuid id() const;
-    QList<Event> events() const;
+    QList<EventDescriptor> eventDescriptors() const;
     QList<State> states() const;
     QList<Action> actions() const;
 
@@ -46,7 +46,7 @@ public:
 
 private:
     QUuid m_id;
-    QList<Event> m_events;
+    QList<EventDescriptor> m_eventDescriptors;
     QList<State> m_states;
     StateEvaluator stateEvaluator;
     QList<Action> m_actions;
diff --git a/server/ruleengine.cpp b/server/ruleengine.cpp
index fb556ccd..71761385 100644
--- a/server/ruleengine.cpp
+++ b/server/ruleengine.cpp
@@ -25,9 +25,9 @@
     \inmodule server
 
     You can add, remove and update rules and query the engine for actions to be executed
-    for a given \l{Event}.
+    for a given \l{Event} described by an \l{EventDescriptor}.
 
-    \sa Event, Rule, Action
+    \sa Event, EventDescriptor, Rule, Action
 */
 
 /*! \fn void RuleEngine::ruleAdded(const QUuid &ruleId)
@@ -51,6 +51,8 @@
     */
 
 #include "ruleengine.h"
+#include "types/paramdescriptor.h"
+#include "types/eventdescriptor.h"
 
 #include "guhcore.h"
 
@@ -80,17 +82,17 @@ RuleEngine::RuleEngine(QObject *parent) :
         settings.beginGroup("event");
         EventTypeId eventTypeId(settings.value("eventTypeId").toString());
         DeviceId deviceId(settings.value("deviceId").toString());
-        QList<Param> params;
+        QList<ParamDescriptor> params;
         foreach (QString groupName, settings.childGroups()) {
-            if (groupName.startsWith("Param-")) {
+            if (groupName.startsWith("ParamDescriptor-")) {
                 settings.beginGroup(groupName);
-                Param param(groupName.remove(QRegExp("^Param-")), settings.value("value"));
-                param.setOperand((Param::OperandType)settings.value("operand").toInt());
-                params.append(param);
+                ParamDescriptor paramDescriptor(groupName.remove(QRegExp("^ParamDescriptor-")), settings.value("value"));
+                paramDescriptor.setOperand((ParamDescriptor::OperandType)settings.value("operand").toInt());
+                params.append(paramDescriptor);
                 settings.endGroup();
             }
         }
-        Event event(eventTypeId, deviceId, params);
+        EventDescriptor eventDescriptor(eventTypeId, deviceId, params);
         settings.endGroup();
 
         settings.beginGroup("states");
@@ -114,7 +116,6 @@ RuleEngine::RuleEngine(QObject *parent) :
                 if (paramNameString.startsWith("Param-")) {
                     settings.beginGroup(paramNameString);
                     Param param(paramNameString.remove(QRegExp("^Param-")), settings.value("value"));
-                    param.setOperand((Param::OperandType)settings.value("operand").toInt());
                     params.append(param);
                     settings.endGroup();
                 }
@@ -128,7 +129,7 @@ RuleEngine::RuleEngine(QObject *parent) :
 
         settings.endGroup();
 
-        Rule rule = Rule(QUuid(idString), event, states, actions);
+        Rule rule = Rule(QUuid(idString), eventDescriptor, states, actions);
         m_rules.append(rule);
     }
 
@@ -143,8 +144,8 @@ QList<Action> RuleEngine::evaluateEvent(const Event &event)
     qDebug() << "got event:" << event;
     QList<Action> actions;
     for (int i = 0; i < m_rules.count(); ++i) {
-        qDebug() << "evaluating rule" << i << m_rules.at(i).events();
-        if (m_rules.at(i).events().contains(event)) {
+        qDebug() << "evaluating rule" << i << m_rules.at(i).eventDescriptors();
+        if (containsEvent(m_rules.at(i), event)) {
             bool statesMatching = true;
             qDebug() << "checking states:" << m_rules.at(i).states();
             foreach (const State &state, m_rules.at(i).states()) {
@@ -172,17 +173,17 @@ QList<Action> RuleEngine::evaluateEvent(const Event &event)
 
 /*! Add a new \l{Rule} with the given \a event and \a actions to the engine.
     For convenience, this creates a Rule without any \l{State} comparison. */
-RuleEngine::RuleError RuleEngine::addRule(const Event &event, const QList<Action> &actions)
+RuleEngine::RuleError RuleEngine::addRule(const EventDescriptor &eventDescriptor, const QList<Action> &actions)
 {
-    return addRule(event, QList<State>(), actions);
+    return addRule(eventDescriptor, QList<State>(), actions);
 }
 
 /*! Add a new \l{Rule} with the given \a event, \a states and \a actions to the engine. */
-RuleEngine::RuleError RuleEngine::addRule(const Event &event, const QList<State> &states, const QList<Action> &actions)
+RuleEngine::RuleError RuleEngine::addRule(const EventDescriptor &eventDescriptor, const QList<State> &states, const QList<Action> &actions)
 {
-    Device *device = GuhCore::instance()->deviceManager()->findConfiguredDevice(event.deviceId());
+    Device *device = GuhCore::instance()->deviceManager()->findConfiguredDevice(eventDescriptor.deviceId());
     if (!device) {
-        qWarning() << "Cannot create rule. No configured device for eventTypeId" << event.eventTypeId();
+        qWarning() << "Cannot create rule. No configured device for eventTypeId" << eventDescriptor.eventTypeId();
         return RuleErrorDeviceNotFound;
     }
     DeviceClass deviceClass = GuhCore::instance()->deviceManager()->findDeviceClass(device->deviceClassId());
@@ -190,28 +191,28 @@ RuleEngine::RuleError RuleEngine::addRule(const Event &event, const QList<State>
 
     bool eventTypeFound = false;
     foreach (const EventType &eventType, deviceClass.events()) {
-        if (eventType.id() == event.eventTypeId()) {
+        if (eventType.id() == eventDescriptor.eventTypeId()) {
             eventTypeFound = true;
         }
     }
     if (!eventTypeFound) {
-        qWarning() << "Cannot create rule. Device " + device->name() + " has no event type:" << event.eventTypeId();
+        qWarning() << "Cannot create rule. Device " + device->name() + " has no event type:" << eventDescriptor.eventTypeId();
         return RuleErrorEventTypeNotFound;
     }
 
-    Rule rule = Rule(QUuid::createUuid(), event, states, actions);
+    Rule rule = Rule(QUuid::createUuid(), eventDescriptor, states, actions);
     m_rules.append(rule);
     emit ruleAdded(rule.id());
 
     QSettings settings(m_settingsFile);
     settings.beginGroup(rule.id().toString());
     settings.beginGroup("event");
-    settings.setValue("eventTypeId", event.eventTypeId());
-    settings.setValue("deviceId", event.deviceId());
-    foreach (const Param &param, event.params()) {
-        settings.beginGroup("Param-" + param.name());
-        settings.setValue("value", param.value());
-        settings.setValue("operand", param.operand());
+    settings.setValue("eventTypeId", eventDescriptor.eventTypeId());
+    settings.setValue("deviceId", eventDescriptor.deviceId());
+    foreach (const ParamDescriptor &paramDescriptor, eventDescriptor.paramDescriptors()) {
+        settings.beginGroup("ParamDescriptor-" + paramDescriptor.name());
+        settings.setValue("value", paramDescriptor.value());
+        settings.setValue("operand", paramDescriptor.operand());
         settings.endGroup();
     }
 
@@ -274,3 +275,13 @@ RuleEngine::RuleError RuleEngine::removeRule(const QUuid &ruleId)
     }
     return RuleErrorRuleNotFound;
 }
+
+bool RuleEngine::containsEvent(const Rule &rule, const Event &event)
+{
+    foreach (const EventDescriptor &eventDescriptor, rule.eventDescriptors()) {
+        if (eventDescriptor == event) {
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/server/ruleengine.h b/server/ruleengine.h
index 35870044..9b9fb1a2 100644
--- a/server/ruleengine.h
+++ b/server/ruleengine.h
@@ -41,8 +41,8 @@ public:
 
     QList<Action> evaluateEvent(const Event &event);
 
-    RuleError addRule(const Event &event, const QList<Action> &actions);
-    RuleError addRule(const Event &event, const QList<State> &states, const QList<Action> &actions);
+    RuleError addRule(const EventDescriptor &eventDescriptor, const QList<Action> &actions);
+    RuleError addRule(const EventDescriptor &eventDescriptor, const QList<State> &states, const QList<Action> &actions);
     QList<Rule> rules() const;
 
     RuleError removeRule(const QUuid &ruleId);
@@ -51,6 +51,9 @@ signals:
     void ruleAdded(const QUuid &ruleId);
     void ruleRemoved(const QUuid &ruleId);
 
+private:
+    bool containsEvent(const Rule &rule, const Event &event);
+
 private:
     QString m_settingsFile;
     QList<Rule> m_rules;
diff --git a/tests/auto/testjsonrpc.cpp b/tests/auto/testjsonrpc.cpp
index 3d6cced4..47993c5e 100644
--- a/tests/auto/testjsonrpc.cpp
+++ b/tests/auto/testjsonrpc.cpp
@@ -566,8 +566,13 @@ void TestJSONRPC::storedDevices()
     foreach (const QVariant device, response.toMap().value("params").toMap().value("devices").toList()) {
         qDebug() << "found stored device" << device;
         if (DeviceId(device.toMap().value("id").toString()) == addedDeviceId) {
-            qDebug() << "found added device" << device.toMap().value("params").toList().first();
-            QCOMPARE(device.toMap().value("params").toMap(), deviceParams);
+//            foreach (const QVariant &paramVariant, device.toMap().value("params").toList()) {
+//                if ()
+//            }
+
+            qDebug() << "found added device" << device.toMap().value("params").toList().first().toMap();
+            qDebug() << "expected deviceParams:" << deviceParams;
+            QCOMPARE(device.toMap().value("params").toList().first().toMap(), deviceParams);
         }
     }