Simple Caption Definition: <div u="caption" t="MCLIP|B" ...><div/>
Define both 't' and 't2': <div u="caption" t="MCLIP|B" t2="T" ...><div/>
Disable 'Play In': <div u="caption" t="NO" t2="MCLIP|B" ...><div/>
Disable 'Play Out': <div u="caption" t="MCLIP|B" t2="NO" ...><div/>
