Root Elements Attributes of SMIL
SMIL quick time extensions has defined few additional attributes to the element, they are auto play it specifies about the resulting presentation whether it automatically start play back on instantiation, the legal values of it are true or false and the default of it false, and the second element is next, after the presentation is finished it specifies to the player it says that the presentation referenced in the attribute value should be invoked and played in the same space, it was used to present the chain presentations together. The capability is

