Adobe Premiere Pro CC v.7.xx - Manual (Page 277)

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Supported caption formats
Premiere Pro supports reading and writing captions for MXF OP1a files. The captions are read from and written to the SMPTE 436M
ancillary data track in the MXF OP1a file.
Premiere Pro supports importing and exporting CEA-708 captions. CEA-708 closed caption files can be exported as a Sidecar file with a .mcc
or .xml filename format. Or you can embed the CEA-708 captions within the SMPTE 436M ancillary data track in MXF OP1a files.
Premiere Pro reads captions in QuickTime movies regardless of the video codec used.
Premiere Pro lets you import caption files with a *.dfxp filename extension.
DFXP caption files are XML-based files. So besides viewing the captions in the Captions panel, they are also viewable from a text editor.
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