Proper format for XML to play a list of videos?

There isn't one. You can use BrightScript to parse any well formed XML you want. There is no particular schema you're required to use.

The video player example in the SDK demonstrates how to parse and make use of data in a specialized XML schema. Or MRSS (my personal favorite) is a popular standard for video delivery (http://en.wikipedia.org/wiki/Media_RSS). Or you could use something else, it depends what makes the most sense for your project.

I have xml already running for my channel but thought there might be a different way it needs to be coded to play a set of videos one after another without needing to be chosen by remote.

Thank you.

Oh, ok. Again, it depends on the specifics of your project, but continuous play is likely something you'll implement in BrightScript. No need to modify your XML unless there's a requirement to be able to control some aspect of the behavior from the server side.

I see, so I just have to figure out how to do the coding then for a function in the brs file.