[FIG(quote)[
[FIGCAPTION[
[1] ([TIME[2017-05-24 23:41:54 +09:00]])
<https://tech.ebu.ch/docs/tech/tech3350.pdf>
]FIGCAPTION]

> EBU-TT Metadata ebuttm: urn:ebu:tt:metadata
> EBU-TT Styling ebutts: urn:ebu:tt:style
> EBU-TT Datatypes ebuttdt: urn:ebu:tt:datatypes

]FIG]