diff --git a/libraries/entities/src/EntityItemProperties.cpp b/libraries/entities/src/EntityItemProperties.cpp
index 788217b847..a16a4fbaba 100644
--- a/libraries/entities/src/EntityItemProperties.cpp
+++ b/libraries/entities/src/EntityItemProperties.cpp
@@ -346,7 +346,11 @@ EntityPropertyFlags EntityItemProperties::getChangedProperties() const {
     return changedProperties;
 }
 
-QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool skipDefaults, bool allowUknownCreateTime) const {
+QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool skipDefaults, bool allowUknownCreateTime, bool strictSemantics) const {
+    // If strictSemantics is true and skipDefaults is false, then all and only those properties are copied in the property flag
+    // is included in _desiredProperties, or is one of the specially enumerated ALWAYS properties below.
+    // (There may be exceptions, but if so, they are bugs.)
+    // In all other cases, you are welcome to inspect the code and try to figure out what was intended. I wish you luck. -HRS 1/18/17
     QScriptValue properties = engine->newObject();
     EntityItemProperties defaultEntityProperties;
 
@@ -364,7 +368,7 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
     created.setTimeSpec(Qt::OffsetFromUTC);
     COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_ALWAYS(created, created.toString(Qt::ISODate));
 
-    if (!skipDefaults || _lifetime != defaultEntityProperties._lifetime) {
+    if ((!skipDefaults || _lifetime != defaultEntityProperties._lifetime) && !strictSemantics) {
         COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_NO_SKIP(age, getAge()); // gettable, but not settable
         COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_NO_SKIP(ageAsText, formatSecondsElapsed(getAge())); // gettable, but not settable
     }
@@ -539,7 +543,7 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
     }
 
     // Sitting properties support
-    if (!skipDefaults) {
+    if (!skipDefaults && !strictSemantics) {
         QScriptValue sittingPoints = engine->newObject();
         for (int i = 0; i < _sittingPoints.size(); ++i) {
             QScriptValue sittingPoint = engine->newObject();
@@ -552,7 +556,7 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
         COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_ALWAYS(sittingPoints, sittingPoints); // gettable, but not settable
     }
 
-    if (!skipDefaults) {
+    if (!skipDefaults && !strictSemantics) {
         AABox aaBox = getAABox();
         QScriptValue boundingBox = engine->newObject();
         QScriptValue bottomRightNear = vec3toScriptValue(engine, aaBox.getCorner());
@@ -567,7 +571,7 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
     }
 
     QString textureNamesStr = QJsonDocument::fromVariant(_textureNames).toJson();
-    if (!skipDefaults) {
+    if (!skipDefaults && !strictSemantics) {
         COPY_PROPERTY_TO_QSCRIPTVALUE_GETTER_NO_SKIP(originalTextures, textureNamesStr); // gettable, but not settable
     }
 
@@ -584,7 +588,7 @@ QScriptValue EntityItemProperties::copyToScriptValue(QScriptEngine* engine, bool
     COPY_PROPERTY_TO_QSCRIPTVALUE(PROP_OWNING_AVATAR_ID, owningAvatarID);
 
     // Rendering info
-    if (!skipDefaults) {
+    if (!skipDefaults && !strictSemantics) {
         QScriptValue renderInfo = engine->newObject();
 
         // currently only supported by models
diff --git a/libraries/entities/src/EntityItemProperties.h b/libraries/entities/src/EntityItemProperties.h
index 20491bdaf5..dd81792283 100644
--- a/libraries/entities/src/EntityItemProperties.h
+++ b/libraries/entities/src/EntityItemProperties.h
@@ -73,7 +73,7 @@ public:
     EntityTypes::EntityType getType() const { return _type; }
     void setType(EntityTypes::EntityType type) { _type = type; }
 
-    virtual QScriptValue copyToScriptValue(QScriptEngine* engine, bool skipDefaults, bool allowUknownCreateTime = false) const;
+    virtual QScriptValue copyToScriptValue(QScriptEngine* engine, bool skipDefaults, bool allowUknownCreateTime = false, bool strictSemantics = false) const;
     virtual void copyFromScriptValue(const QScriptValue& object, bool honorReadOnly);
 
     static QScriptValue entityPropertyFlagsToScriptValue(QScriptEngine* engine, const EntityPropertyFlags& flags);
@@ -93,6 +93,8 @@ public:
 
     void debugDump() const;
     void setLastEdited(quint64 usecTime);
+    EntityPropertyFlags getDesiredProperties() { return _desiredProperties; }
+    void setDesiredProperties(EntityPropertyFlags properties) {  _desiredProperties = properties; }
 
     // Note:  DEFINE_PROPERTY(PROP_FOO, Foo, foo, type, value) creates the following methods and variables:
     // type getFoo() const;