+ ITmfStateValue queryOngoingState(int attributeQuark)
+ throws AttributeNotFoundException;
+
+ /**
+ * Get the start time of the current ongoing state, for the specified
+ * attribute.
+ *
+ * @param attribute
+ * Quark of the attribute
+ * @return The current start time of the ongoing state
+ * @throws AttributeNotFoundException
+ * If the attribute is invalid
+ */
+ long getOngoingStartTime(int attribute)