Edge Animate 1.5 multiple compositions

I read the following in the edge 1.5 api docs:

As of Edge Animate 1.5, opening a page with more than one composition in it is not supported, but pages can be hand-authored to use multiple compositions.

What exactly does it mean, that I can put only a single composition in a HTML page?

If so, what is the "Hand-authord" solution that you offer? can you please elaborate a little bit in this issue?

Thanks for the help,

Yotam.