public FieldUpdate addValueUpdates(List<ValueUpdate> valueUpdates) {
        for (ValueUpdate vupd : valueUpdates) {
            addValueUpdate(vupd);
        }
        return this;
    }
Adds a list of value updates to the list of value updates.

@param valueUpdates a list containing the value updates to add
@return a reference to itself
@throws IllegalArgumentException if the data type of the value update is not equal to the data type of this field
document/src/main/java/com/yahoo/document/update/FieldUpdate.java