Have multiple renditions of a single graphic

As a braille content creator, I would like to ensure that the tactile graphics I provide are available in different file formats so that I can maximize the possibility that they will be supported by the hardware available to the end user.

*Detail*
Different hardware has different software requirements. It may be that it's necessary for content creators to have the option to include different file formats so that they can be sure the tactile graphics can be rendered by the end user.

*Proposal*
It should be possible for the content creator to include different file formats of the same graphic and for reading software to be able to parse through these different possibilities and find the one that is best suited for the hardware's capabilities.

Ideally the content creator will know the hardware capabilities of their end user and/or the file format that is preferred by the ebraille format is such that it has a wide range of built-in support so that these multiple file formats are not required as such a requirement could be burdensome for content creators and libraries.

No file, test, or entry point is identified in the issue. Start by reviewing the repository's existing ebraille standard and use cases, then define how multiple renditions are represented and how reading software selects a rendition for the end user's hardware; done means the behavior is specified clearly enough to implement and validate.

Written by the indexing model from the issue text.